Update CONTRIBUTING.md
Update CONTRIBUTING.md

Correct link to wiki page explaining how to work with source, run demos and tests.
nrallakis/libgdx,firefly2442/libgdx,copystudy/libgdx,srwonka/libGdx,kagehak/libgdx,alex-dorokhov/libgdx,tommyettinger/libgdx,Wisienkas/libgdx,revo09/libgdx,nelsonsilva/libgdx,nave966/libgdx,MadcowD/libgdx,designcrumble/libgdx,collinsmith/libgdx,alex-dorokhov/libgdx,saqsun/libgdx,js78/libgdx,Senth/libgdx,SidneyXu/libgdx,billgame/libgdx,Xhanim/libgdx,firefly2442/libgdx,MikkelTAndersen/libgdx,thepullman/libgdx,firefly2442/libgdx,azakhary/libgdx,ya7lelkom/libgdx,zommuter/libgdx,thepullman/libgdx,nelsonsilva/libgdx,alex-dorokhov/libgdx,1yvT0s/libgdx,luischavez/libgdx,haedri/libgdx-1,titovmaxim/libgdx,mumer92/libgdx,realitix/libgdx,fwolff/libgdx,andyvand/libgdx,kagehak/libgdx,TheAks999/libgdx,jberberick/libgdx,KrisLee/libgdx,FredGithub/libgdx,alireza-hosseini/libgdx,thepullman/libgdx,tell10glu/libgdx,Arcnor/libgdx,codepoke/libgdx,JDReutt/libgdx,UnluckyNinja/libgdx,Badazdz/libgdx,Dzamir/libgdx,NathanSweet/libgdx,JFixby/libgdx,designcrumble/libgdx,gdos/libgdx,andyvand/libgdx,ThiagoGarciaAlves/libgdx,GreenLightning/libgdx,czyzby/libgdx,FyiurAmron/libgdx,junkdog/libgdx,josephknight/libgdx,gdos/libgdx,youprofit/libgdx,flaiker/libgdx,petugez/libgdx,djom20/libgdx,kotcrab/libgdx,xranby/libgdx,czyzby/libgdx,309746069/libgdx,ztv/libgdx,revo09/libgdx,GreenLightning/libgdx,anserran/libgdx,samskivert/libgdx,Gliby/libgdx,alex-dorokhov/libgdx,Xhanim/libgdx,ttencate/libgdx,sinistersnare/libgdx,billgame/libgdx,ztv/libgdx,toa5/libgdx,shiweihappy/libgdx,jsjolund/libgdx,fiesensee/libgdx,bsmr-java/libgdx,nrallakis/libgdx,codepoke/libgdx,JDReutt/libgdx,Gliby/libgdx,collinsmith/libgdx,nudelchef/libgdx,BlueRiverInteractive/libgdx,davebaol/libgdx,curtiszimmerman/libgdx,revo09/libgdx,EsikAntony/libgdx,djom20/libgdx,kagehak/libgdx,saqsun/libgdx,haedri/libgdx-1,basherone/libgdxcn,Zonglin-Li6565/libgdx,del-sol/libgdx,fiesensee/libgdx,Badazdz/libgdx,jasonwee/libgdx,JDReutt/libgdx,ttencate/libgdx,TheAks999/libgdx,realitix/libgdx,zhimaijoy/libgdx,zhimaijoy/libgdx,gdos/libgdx,309746069/libgdx,yangweigbh/libgdx,shiweihappy/libgdx,xranby/libgdx,copystudy/libgdx,Zonglin-Li6565/libgdx,SidneyXu/libgdx,1yvT0s/libgdx,youprofit/libgdx,andyvand/libgdx,MikkelTAndersen/libgdx,hyvas/libgdx,nave966/libgdx,codepoke/libgdx,tell10glu/libgdx,GreenLightning/libgdx,basherone/libgdxcn,titovmaxim/libgdx,flaiker/libgdx,BlueRiverInteractive/libgdx,ricardorigodon/libgdx,jsjolund/libgdx,saqsun/libgdx,jberberick/libgdx,FredGithub/libgdx,nudelchef/libgdx,djom20/libgdx,luischavez/libgdx,zhimaijoy/libgdx,cypherdare/libgdx,nudelchef/libgdx,xpenatan/libgdx-LWJGL3,junkdog/libgdx,czyzby/libgdx,toa5/libgdx,gdos/libgdx,Thotep/libgdx,Deftwun/libgdx,del-sol/libgdx,nave966/libgdx,toa5/libgdx,junkdog/libgdx,Arcnor/libgdx,zhimaijoy/libgdx,copystudy/libgdx,Badazdz/libgdx,kagehak/libgdx,tommycli/libgdx,cypherdare/libgdx,Senth/libgdx,kotcrab/libgdx,shiweihappy/libgdx,xoppa/libgdx,czyzby/libgdx,KrisLee/libgdx,youprofit/libgdx,Badazdz/libgdx,anserran/libgdx,ThiagoGarciaAlves/libgdx,JDReutt/libgdx,codepoke/libgdx,gouessej/libgdx,cypherdare/libgdx,PedroRomanoBarbosa/libgdx,luischavez/libgdx,collinsmith/libgdx,azakhary/libgdx,EsikAntony/libgdx,libgdx/libgdx,UnluckyNinja/libgdx,Xhanim/libgdx,haedri/libgdx-1,mumer92/libgdx,Heart2009/libgdx,Senth/libgdx,sjosegarcia/libgdx,EsikAntony/libgdx,bladecoder/libgdx,1yvT0s/libgdx,jsjolund/libgdx,snovak/libgdx,alireza-hosseini/libgdx,yangweigbh/libgdx,samskivert/libgdx,Wisienkas/libgdx,309746069/libgdx,czyzby/libgdx,jberberick/libgdx,Gliby/libgdx,gouessej/libgdx,josephknight/libgdx,stinsonga/libgdx,gdos/libgdx,curtiszimmerman/libgdx,snovak/libgdx,curtiszimmerman/libgdx,xpenatan/libgdx-LWJGL3,Heart2009/libgdx,djom20/libgdx,MetSystem/libgdx,katiepino/libgdx,jsjolund/libgdx,jasonwee/libgdx,sjosegarcia/libgdx,ThiagoGarciaAlves/libgdx,JFixby/libgdx,KrisLee/libgdx,thepullman/libgdx,luischavez/libgdx,tommycli/libgdx,kotcrab/libgdx,nave966/libgdx,UnluckyNinja/libgdx,anserran/libgdx,saqsun/libgdx,jasonwee/libgdx,gf11speed/libgdx,cypherdare/libgdx,libgdx/libgdx,snovak/libgdx,MetSystem/libgdx,GreenLightning/libgdx,kagehak/libgdx,jsjolund/libgdx,nrallakis/libgdx,tommycli/libgdx,Heart2009/libgdx,bladecoder/libgdx,fiesensee/libgdx,realitix/libgdx,junkdog/libgdx,FyiurAmron/libgdx,azakhary/libgdx,saqsun/libgdx,billgame/libgdx,codepoke/libgdx,ninoalma/libgdx,toloudis/libgdx,yangweigbh/libgdx,Thotep/libgdx,UnluckyNinja/libgdx,ttencate/libgdx,Deftwun/libgdx,realitix/libgdx,copystudy/libgdx,firefly2442/libgdx,stickyd/libgdx,hyvas/libgdx,zhimaijoy/libgdx,Deftwun/libgdx,NathanSweet/libgdx,zommuter/libgdx,JDReutt/libgdx,MetSystem/libgdx,Dzamir/libgdx,anserran/libgdx,FyiurAmron/libgdx,sarkanyi/libgdx,zommuter/libgdx,Badazdz/libgdx,nave966/libgdx,bladecoder/libgdx,bgroenks96/libgdx,Zonglin-Li6565/libgdx,js78/libgdx,nelsonsilva/libgdx,Gliby/libgdx,anserran/libgdx,firefly2442/libgdx,FredGithub/libgdx,noelsison2/libgdx,ttencate/libgdx,Dzamir/libgdx,azakhary/libgdx,luischavez/libgdx,firefly2442/libgdx,katiepino/libgdx,PedroRomanoBarbosa/libgdx,jasonwee/libgdx,del-sol/libgdx,ninoalma/libgdx,ThiagoGarciaAlves/libgdx,jberberick/libgdx,saltares/libgdx,BlueRiverInteractive/libgdx,MadcowD/libgdx,JDReutt/libgdx,nudelchef/libgdx,katiepino/libgdx,KrisLee/libgdx,djom20/libgdx,bsmr-java/libgdx,jasonwee/libgdx,js78/libgdx,KrisLee/libgdx,hyvas/libgdx,zommuter/libgdx,nooone/libgdx,MetSystem/libgdx,stinsonga/libgdx,Badazdz/libgdx,Zonglin-Li6565/libgdx,flaiker/libgdx,titovmaxim/libgdx,ThiagoGarciaAlves/libgdx,Gliby/libgdx,NathanSweet/libgdx,designcrumble/libgdx,shiweihappy/libgdx,TheAks999/libgdx,PedroRomanoBarbosa/libgdx,billgame/libgdx,noelsison2/libgdx,ztv/libgdx,josephknight/libgdx,ninoalma/libgdx,srwonka/libGdx,MovingBlocks/libgdx,GreenLightning/libgdx,JDReutt/libgdx,gouessej/libgdx,saltares/libgdx,stickyd/libgdx,gouessej/libgdx,Thotep/libgdx,stickyd/libgdx,davebaol/libgdx,FredGithub/libgdx,Heart2009/libgdx,zommuter/libgdx,1yvT0s/libgdx,SidneyXu/libgdx,TheAks999/libgdx,Xhanim/libgdx,ricardorigodon/libgdx,fiesensee/libgdx,sjosegarcia/libgdx,ricardorigodon/libgdx,noelsison2/libgdx,JDReutt/libgdx,Arcnor/libgdx,Gliby/libgdx,flaiker/libgdx,MovingBlocks/libgdx,zhimaijoy/libgdx,SidneyXu/libgdx,ya7lelkom/libgdx,Deftwun/libgdx,ya7lelkom/libgdx,sjosegarcia/libgdx,shiweihappy/libgdx,toloudis/libgdx,Thotep/libgdx,xoppa/libgdx,tommycli/libgdx,hyvas/libgdx,srwonka/libGdx,bgroenks96/libgdx,antag99/libgdx,Badazdz/libgdx,JFixby/libgdx,gf11speed/libgdx,309746069/libgdx,PedroRomanoBarbosa/libgdx,tommycli/libgdx,gouessej/libgdx,collinsmith/libgdx,ztv/libgdx,thepullman/libgdx,designcrumble/libgdx,Thotep/libgdx,bgroenks96/libgdx,djom20/libgdx,xoppa/libgdx,MovingBlocks/libgdx,UnluckyNinja/libgdx,antag99/libgdx,hyvas/libgdx,nooone/libgdx,Arcnor/libgdx,stinsonga/libgdx,davebaol/libgdx,nrallakis/libgdx,tommycli/libgdx,alex-dorokhov/libgdx,bladecoder/libgdx,del-sol/libgdx,thepullman/libgdx,Zonglin-Li6565/libgdx,flaiker/libgdx,samskivert/libgdx,haedri/libgdx-1,fwolff/libgdx,Xhanim/libgdx,noelsison2/libgdx,shiweihappy/libgdx,FyiurAmron/libgdx,FredGithub/libgdx,josephknight/libgdx,sjosegarcia/libgdx,Dzamir/libgdx,stickyd/libgdx,toa5/libgdx,KrisLee/libgdx,nooone/libgdx,xranby/libgdx,Heart2009/libgdx,snovak/libgdx,ztv/libgdx,jsjolund/libgdx,Arcnor/libgdx,Xhanim/libgdx,xranby/libgdx,PedroRomanoBarbosa/libgdx,antag99/libgdx,ninoalma/libgdx,titovmaxim/libgdx,codepoke/libgdx,saltares/libgdx,anserran/libgdx,fiesensee/libgdx,js78/libgdx,shiweihappy/libgdx,MadcowD/libgdx,jberberick/libgdx,toa5/libgdx,kotcrab/libgdx,gf11speed/libgdx,MikkelTAndersen/libgdx,xranby/libgdx,curtiszimmerman/libgdx,NathanSweet/libgdx,toloudis/libgdx,toa5/libgdx,xoppa/libgdx,alex-dorokhov/libgdx,ninoalma/libgdx,alireza-hosseini/libgdx,309746069/libgdx,xpenatan/libgdx-LWJGL3,FyiurAmron/libgdx,bsmr-java/libgdx,jsjolund/libgdx,BlueRiverInteractive/libgdx,309746069/libgdx,MetSystem/libgdx,1yvT0s/libgdx,Deftwun/libgdx,jasonwee/libgdx,jberberick/libgdx,toloudis/libgdx,curtiszimmerman/libgdx,azakhary/libgdx,sinistersnare/libgdx,czyzby/libgdx,stinsonga/libgdx,revo09/libgdx,tell10glu/libgdx,ya7lelkom/libgdx,libgdx/libgdx,fwolff/libgdx,junkdog/libgdx,SidneyXu/libgdx,snovak/libgdx,luischavez/libgdx,js78/libgdx,del-sol/libgdx,Wisienkas/libgdx,designcrumble/libgdx,FredGithub/libgdx,kotcrab/libgdx,ztv/libgdx,tell10glu/libgdx,sarkanyi/libgdx,libgdx/libgdx,mumer92/libgdx,alex-dorokhov/libgdx,basherone/libgdxcn,flaiker/libgdx,nooone/libgdx,yangweigbh/libgdx,collinsmith/libgdx,Dzamir/libgdx,billgame/libgdx,hyvas/libgdx,xpenatan/libgdx-LWJGL3,del-sol/libgdx,1yvT0s/libgdx,haedri/libgdx-1,noelsison2/libgdx,xpenatan/libgdx-LWJGL3,junkdog/libgdx,srwonka/libGdx,Badazdz/libgdx,ttencate/libgdx,nelsonsilva/libgdx,josephknight/libgdx,ThiagoGarciaAlves/libgdx,bgroenks96/libgdx,codepoke/libgdx,firefly2442/libgdx,xranby/libgdx,Zomby2D/libgdx,katiepino/libgdx,realitix/libgdx,bsmr-java/libgdx,youprofit/libgdx,PedroRomanoBarbosa/libgdx,FredGithub/libgdx,EsikAntony/libgdx,309746069/libgdx,Senth/libgdx,billgame/libgdx,curtiszimmerman/libgdx,davebaol/libgdx,PedroRomanoBarbosa/libgdx,saqsun/libgdx,davebaol/libgdx,js78/libgdx,copystudy/libgdx,codepoke/libgdx,srwonka/libGdx,gdos/libgdx,srwonka/libGdx,alireza-hosseini/libgdx,realitix/libgdx,kagehak/libgdx,Xhanim/libgdx,titovmaxim/libgdx,MadcowD/libgdx,stinsonga/libgdx,sinistersnare/libgdx,mumer92/libgdx,andyvand/libgdx,ya7lelkom/libgdx,BlueRiverInteractive/libgdx,youprofit/libgdx,nooone/libgdx,Dzamir/libgdx,nudelchef/libgdx,TheAks999/libgdx,copystudy/libgdx,del-sol/libgdx,nudelchef/libgdx,Heart2009/libgdx,MovingBlocks/libgdx,309746069/libgdx,samskivert/libgdx,UnluckyNinja/libgdx,youprofit/libgdx,MikkelTAndersen/libgdx,stickyd/libgdx,FyiurAmron/libgdx,alireza-hosseini/libgdx,MetSystem/libgdx,jberberick/libgdx,snovak/libgdx,samskivert/libgdx,Deftwun/libgdx,billgame/libgdx,davebaol/libgdx,jsjolund/libgdx,antag99/libgdx,Heart2009/libgdx,haedri/libgdx-1,MovingBlocks/libgdx,Senth/libgdx,Wisienkas/libgdx,TheAks999/libgdx,nelsonsilva/libgdx,bsmr-java/libgdx,JFixby/libgdx,djom20/libgdx,JFixby/libgdx,ninoalma/libgdx,flaiker/libgdx,andyvand/libgdx,Thotep/libgdx,basherone/libgdxcn,copystudy/libgdx,EsikAntony/libgdx,andyvand/libgdx,kotcrab/libgdx,gdos/libgdx,ricardorigodon/libgdx,stickyd/libgdx,titovmaxim/libgdx,saltares/libgdx,srwonka/libGdx,junkdog/libgdx,Wisienkas/libgdx,Wisienkas/libgdx,Wisienkas/libgdx,sarkanyi/libgdx,flaiker/libgdx,KrisLee/libgdx,czyzby/libgdx,kagehak/libgdx,haedri/libgdx-1,1yvT0s/libgdx,ThiagoGarciaAlves/libgdx,MovingBlocks/libgdx,kotcrab/libgdx,saltares/libgdx,saqsun/libgdx,MadcowD/libgdx,BlueRiverInteractive/libgdx,gf11speed/libgdx,FyiurAmron/libgdx,tommyettinger/libgdx,gf11speed/libgdx,stickyd/libgdx,gouessej/libgdx,sinistersnare/libgdx,jasonwee/libgdx,youprofit/libgdx,FredGithub/libgdx,copystudy/libgdx,JFixby/libgdx,billgame/libgdx,ricardorigodon/libgdx,curtiszimmerman/libgdx,petugez/libgdx,jasonwee/libgdx,MikkelTAndersen/libgdx,MadcowD/libgdx,tell10glu/libgdx,titovmaxim/libgdx,Zomby2D/libgdx,cypherdare/libgdx,luischavez/libgdx,MetSystem/libgdx,Deftwun/libgdx,gf11speed/libgdx,katiepino/libgdx,fwolff/libgdx,EsikAntony/libgdx,tommycli/libgdx,del-sol/libgdx,nelsonsilva/libgdx,xoppa/libgdx,designcrumble/libgdx,thepullman/libgdx,bsmr-java/libgdx,xranby/libgdx,yangweigbh/libgdx,samskivert/libgdx,nave966/libgdx,Zomby2D/libgdx,mumer92/libgdx,designcrumble/libgdx,sjosegarcia/libgdx,petugez/libgdx,Dzamir/libgdx,Thotep/libgdx,ricardorigodon/libgdx,Zonglin-Li6565/libgdx,sinistersnare/libgdx,revo09/libgdx,noelsison2/libgdx,SidneyXu/libgdx,KrisLee/libgdx,libgdx/libgdx,czyzby/libgdx,js78/libgdx,thepullman/libgdx,sarkanyi/libgdx,saltares/libgdx,xpenatan/libgdx-LWJGL3,alireza-hosseini/libgdx,toloudis/libgdx,nudelchef/libgdx,zhimaijoy/libgdx,josephknight/libgdx,sarkanyi/libgdx,designcrumble/libgdx,fwolff/libgdx,TheAks999/libgdx,realitix/libgdx,fiesensee/libgdx,MovingBlocks/libgdx,anserran/libgdx,hyvas/libgdx,yangweigbh/libgdx,Zomby2D/libgdx,nudelchef/libgdx,basherone/libgdxcn,curtiszimmerman/libgdx,tommycli/libgdx,mumer92/libgdx,gdos/libgdx,fiesensee/libgdx,samskivert/libgdx,ttencate/libgdx,nrallakis/libgdx,katiepino/libgdx,bgroenks96/libgdx,tell10glu/libgdx,MikkelTAndersen/libgdx,djom20/libgdx,ztv/libgdx,basherone/libgdxcn,xoppa/libgdx,Zomby2D/libgdx,saltares/libgdx,GreenLightning/libgdx,zhimaijoy/libgdx,fiesensee/libgdx,MovingBlocks/libgdx,revo09/libgdx,ttencate/libgdx,zommuter/libgdx,haedri/libgdx-1,nave966/libgdx,sarkanyi/libgdx,Senth/libgdx,MetSystem/libgdx,ricardorigodon/libgdx,stickyd/libgdx,bsmr-java/libgdx,toa5/libgdx,antag99/libgdx,collinsmith/libgdx,Zonglin-Li6565/libgdx,xpenatan/libgdx-LWJGL3,sjosegarcia/libgdx,Xhanim/libgdx,snovak/libgdx,ztv/libgdx,bgroenks96/libgdx,EsikAntony/libgdx,xoppa/libgdx,hyvas/libgdx,kagehak/libgdx,gf11speed/libgdx,josephknight/libgdx,petugez/libgdx,petugez/libgdx,toloudis/libgdx,Senth/libgdx,mumer92/libgdx,ttencate/libgdx,BlueRiverInteractive/libgdx,fwolff/libgdx,andyvand/libgdx,fwolff/libgdx,xranby/libgdx,katiepino/libgdx,GreenLightning/libgdx,alireza-hosseini/libgdx,yangweigbh/libgdx,JFixby/libgdx,anserran/libgdx,tommyettinger/libgdx,jberberick/libgdx,azakhary/libgdx,nooone/libgdx,xpenatan/libgdx-LWJGL3,sarkanyi/libgdx,Senth/libgdx,alireza-hosseini/libgdx,nrallakis/libgdx,ya7lelkom/libgdx,GreenLightning/libgdx,MikkelTAndersen/libgdx,petugez/libgdx,Arcnor/libgdx,antag99/libgdx,youprofit/libgdx,titovmaxim/libgdx,Heart2009/libgdx,noelsison2/libgdx,ya7lelkom/libgdx,bgroenks96/libgdx,luischavez/libgdx,Deftwun/libgdx,tell10glu/libgdx,saltares/libgdx,toa5/libgdx,collinsmith/libgdx,zommuter/libgdx,petugez/libgdx,revo09/libgdx,ya7lelkom/libgdx,BlueRiverInteractive/libgdx,tommyettinger/libgdx,FyiurAmron/libgdx,collinsmith/libgdx,srwonka/libGdx,EsikAntony/libgdx,snovak/libgdx,NathanSweet/libgdx,antag99/libgdx,Gliby/libgdx,toloudis/libgdx,noelsison2/libgdx,revo09/libgdx,Gliby/libgdx,sinistersnare/libgdx,junkdog/libgdx,petugez/libgdx,sarkanyi/libgdx,kotcrab/libgdx,yangweigbh/libgdx,UnluckyNinja/libgdx,samskivert/libgdx,gouessej/libgdx,alex-dorokhov/libgdx,MikkelTAndersen/libgdx,katiepino/libgdx,ninoalma/libgdx,gouessej/libgdx,firefly2442/libgdx,SidneyXu/libgdx,toloudis/libgdx,MadcowD/libgdx,js78/libgdx,MadcowD/libgdx,Dzamir/libgdx,realitix/libgdx,Wisienkas/libgdx,mumer92/libgdx,TheAks999/libgdx,ricardorigodon/libgdx,nave966/libgdx,andyvand/libgdx,SidneyXu/libgdx,bsmr-java/libgdx,gf11speed/libgdx,PedroRomanoBarbosa/libgdx,bgroenks96/libgdx,ninoalma/libgdx,sjosegarcia/libgdx,ThiagoGarciaAlves/libgdx,fwolff/libgdx,nrallakis/libgdx,UnluckyNinja/libgdx,nrallakis/libgdx,saqsun/libgdx,zommuter/libgdx,JFixby/libgdx,bladecoder/libgdx,1yvT0s/libgdx,shiweihappy/libgdx,tommyettinger/libgdx,xoppa/libgdx,josephknight/libgdx,Zonglin-Li6565/libgdx,antag99/libgdx,Thotep/libgdx,tell10glu/libgdx