added CONTRIBUTING.md
added CONTRIBUTING.md

sksavant/growstuff,yez/growstuff,CjayBillones/growstuff,yez/growstuff,CjayBillones/growstuff,josefdaly/growstuff,korabh/growstuff,cesy/growstuff,borracciaBlu/growstuff,oshiho3/growstuff,GabrielSandoval/growstuff,CloCkWeRX/growstuff,borracciaBlu/growstuff,pozorvlak/growstuff,GabrielSandoval/growstuff,andrba/growstuff,oshiho3/growstuff,dv2/growstuff,Br3nda/growstuff,cesy/growstuff,CarsonBills/GrowStuffCMB,korabh/growstuff,CloCkWeRX/growstuff,korabh/growstuff,gustavor-souza/growstuff,CarsonBills/GrowStuffCMB,dv2/growstuff,CarsonBills/GrowStuffCMB,josefdaly/growstuff,dv2/growstuff,maco/growstuff,CjayBillones/growstuff,cesy/growstuff,yez/growstuff,CarsonBills/GrowStuffCMB,Br3nda/growstuff,pozorvlak/growstuff,sksavant/growstuff,iressgrad15/growstuff,CloCkWeRX/growstuff,oshiho3/growstuff,borracciaBlu/growstuff,gustavor-souza/growstuff,GabrielSandoval/growstuff,pozorvlak/growstuff,Growstuff/growstuff,andrba/growstuff,CloCkWeRX/growstuff,iressgrad15/growstuff,jdanielnd/growstuff,maco/growstuff,Growstuff/growstuff,cesy/growstuff,andrba/growstuff,josefdaly/growstuff,sksavant/growstuff,CjayBillones/growstuff,iressgrad15/growstuff,Br3nda/growstuff,Br3nda/growstuff,dv2/growstuff,gustavor-souza/growstuff,GabrielSandoval/growstuff,yez/growstuff,borracciaBlu/growstuff,jdanielnd/growstuff,maco/growstuff,gustavor-souza/growstuff,pozorvlak/growstuff,sksavant/growstuff,josefdaly/growstuff,Growstuff/growstuff,maco/growstuff,jdanielnd/growstuff,andrba/growstuff,jdanielnd/growstuff,Growstuff/growstuff,korabh/growstuff,oshiho3/growstuff