doc: add graphic showing general structure of RIOT
doc: add graphic showing general structure of RIOT

d00616/RIOT,yogo1212/RIOT,katezilla/RIOT,backenklee/RIOT,Ell-i/RIOT,kaleb-himes/RIOT,rfuentess/RIOT,BytesGalore/RIOT,MohmadAyman/RIOT,stevenj/RIOT,OlegHahm/RIOT,FrancescoErmini/RIOT,dkm/RIOT,ant9000/RIOT,backenklee/RIOT,thomaseichinger/RIOT,kerneltask/RIOT,rakendrathapa/RIOT,jasonatran/RIOT,Josar/RIOT,rajma996/RIOT,roberthartung/RIOT,LudwigKnuepfer/RIOT,d00616/RIOT,rajma996/RIOT,LudwigOrtmann/RIOT,mtausig/RIOT,shady33/RIOT,ant9000/RIOT,altairpearl/RIOT,attdona/RIOT,TobiasFredersdorf/RIOT,neiljay/RIOT,MohmadAyman/RIOT,ant9000/RIOT,smlng/RIOT,miri64/RIOT,altairpearl/RIOT,MohmadAyman/RIOT,gautric/RIOT,toonst/RIOT,immesys/RiSyn,jfischer-phytec-iot/RIOT,x3ro/RIOT,miri64/RIOT,attdona/RIOT,immesys/RiSyn,immesys/RiSyn,A-Paul/RIOT,smlng/RIOT,thomaseichinger/RIOT,adjih/RIOT,ks156/RIOT,syin2/RIOT,gautric/RIOT,thomaseichinger/RIOT,rakendrathapa/RIOT,l3nko/RIOT,kaspar030/RIOT,mziegert/RIOT,OlegHahm/RIOT,l3nko/RIOT,rakendrathapa/RIOT,miri64/RIOT,LudwigOrtmann/RIOT,avmelnikoff/RIOT,lebrush/RIOT,miri64/RIOT,kYc0o/RIOT,jfischer-phytec-iot/RIOT,jremmert-phytec-iot/RIOT,hamilton-mote/RIOT-OS,RubikonAlpha/RIOT,attdona/RIOT,wentaoshang/RIOT,MohmadAyman/RIOT,kaleb-himes/RIOT,katezilla/RIOT,biboc/RIOT,LudwigOrtmann/RIOT,plushvoxel/RIOT,malosek/RIOT,josephnoir/RIOT,Yonezawa-T2/RIOT,zhuoshuguo/RIOT,Yonezawa-T2/RIOT,neumodisch/RIOT,shady33/RIOT,altairpearl/RIOT,yogo1212/RIOT,TobiasFredersdorf/RIOT,wentaoshang/RIOT,neumodisch/RIOT,neumodisch/RIOT,mziegert/RIOT,RBartz/RIOT,BytesGalore/RIOT,Ell-i/RIOT,binarylemon/RIOT,josephnoir/RIOT,brettswann/RIOT,jfischer-phytec-iot/RIOT,gebart/RIOT,RubikonAlpha/RIOT,RIOT-OS/RIOT,FrancescoErmini/RIOT,stevenj/RIOT,RBartz/RIOT,toonst/RIOT,kbumsik/RIOT,toonst/RIOT,adjih/RIOT,dkm/RIOT,kYc0o/RIOT,mtausig/RIOT,kb2ma/RIOT,LudwigOrtmann/RIOT,lebrush/RIOT,neiljay/RIOT,dailab/RIOT,hamilton-mote/RIOT-OS,alignan/RIOT,Yonezawa-T2/RIOT,kb2ma/RIOT,MohmadAyman/RIOT,thomaseichinger/RIOT,stevenj/RIOT,authmillenon/RIOT,basilfx/RIOT,aeneby/RIOT,avmelnikoff/RIOT,josephnoir/RIOT,gebart/RIOT,RIOT-OS/RIOT,stevenj/RIOT,neumodisch/RIOT,rousselk/RIOT,mtausig/RIOT,binarylemon/RIOT,FrancescoErmini/RIOT,kYc0o/RIOT,neumodisch/RIOT,thomaseichinger/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,mziegert/RIOT,Ell-i/RIOT,gautric/RIOT,basilfx/RIOT,gebart/RIOT,rajma996/RIOT,josephnoir/RIOT,FrancescoErmini/RIOT,mfrey/RIOT,neiljay/RIOT,lazytech-org/RIOT,smlng/RIOT,OTAkeys/RIOT,gebart/RIOT,d00616/RIOT,kb2ma/RIOT,attdona/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,LudwigKnuepfer/RIOT,kerneltask/RIOT,kaspar030/RIOT,mziegert/RIOT,cladmi/RIOT,binarylemon/RIOT,jasonatran/RIOT,jfischer-phytec-iot/RIOT,basilfx/RIOT,basilfx/RIOT,FrancescoErmini/RIOT,wentaoshang/RIOT,roberthartung/RIOT,malosek/RIOT,rfuentess/RIOT,asanka-code/RIOT,d00616/RIOT,shady33/RIOT,dkm/RIOT,RBartz/RIOT,BytesGalore/RIOT,mziegert/RIOT,wentaoshang/RIOT,josephnoir/RIOT,brettswann/RIOT,alignan/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,altairpearl/RIOT,lazytech-org/RIOT,binarylemon/RIOT,stevenj/RIOT,Josar/RIOT,A-Paul/RIOT,backenklee/RIOT,kb2ma/RIOT,authmillenon/RIOT,LudwigOrtmann/RIOT,yogo1212/RIOT,shady33/RIOT,jremmert-phytec-iot/RIOT,zhuoshuguo/RIOT,rakendrathapa/RIOT,Josar/RIOT,kbumsik/RIOT,aeneby/RIOT,TobiasFredersdorf/RIOT,zhuoshuguo/RIOT,backenklee/RIOT,d00616/RIOT,kbumsik/RIOT,adjih/RIOT,avmelnikoff/RIOT,malosek/RIOT,zhuoshuguo/RIOT,ant9000/RIOT,cladmi/RIOT,kaleb-himes/RIOT,kaleb-himes/RIOT,tfar/RIOT,jremmert-phytec-iot/RIOT,asanka-code/RIOT,authmillenon/RIOT,asanka-code/RIOT,adrianghc/RIOT,rfuentess/RIOT,RubikonAlpha/RIOT,beurdouche/RIOT,beurdouche/RIOT,plushvoxel/RIOT,adjih/RIOT,shady33/RIOT,jbeyerstedt/RIOT-OTA-update,shady33/RIOT,asanka-code/RIOT,plushvoxel/RIOT,kaleb-himes/RIOT,RubikonAlpha/RIOT,tfar/RIOT,ks156/RIOT,Ell-i/RIOT,neumodisch/RIOT,smlng/RIOT,A-Paul/RIOT,kerneltask/RIOT,zhuoshuguo/RIOT,syin2/RIOT,Yonezawa-T2/RIOT,katezilla/RIOT,plushvoxel/RIOT,cladmi/RIOT,ks156/RIOT,brettswann/RIOT,RBartz/RIOT,katezilla/RIOT,toonst/RIOT,kbumsik/RIOT,rakendrathapa/RIOT,Hyungsin/RIOT-OS,RIOT-OS/RIOT,x3ro/RIOT,attdona/RIOT,mfrey/RIOT,toonst/RIOT,jbeyerstedt/RIOT-OTA-update,Josar/RIOT,syin2/RIOT,beurdouche/RIOT,adrianghc/RIOT,jasonatran/RIOT,l3nko/RIOT,Josar/RIOT,mtausig/RIOT,wentaoshang/RIOT,kaspar030/RIOT,syin2/RIOT,syin2/RIOT,hamilton-mote/RIOT-OS,A-Paul/RIOT,RIOT-OS/RIOT,attdona/RIOT,biboc/RIOT,BytesGalore/RIOT,RBartz/RIOT,rakendrathapa/RIOT,TobiasFredersdorf/RIOT,LudwigKnuepfer/RIOT,OTAkeys/RIOT,dailab/RIOT,dkm/RIOT,stevenj/RIOT,Hyungsin/RIOT-OS,neiljay/RIOT,authmillenon/RIOT,LudwigKnuepfer/RIOT,rajma996/RIOT,lazytech-org/RIOT,brettswann/RIOT,ks156/RIOT,wentaoshang/RIOT,rousselk/RIOT,authmillenon/RIOT,rajma996/RIOT,authmillenon/RIOT,adrianghc/RIOT,alignan/RIOT,biboc/RIOT,binarylemon/RIOT,kbumsik/RIOT,Hyungsin/RIOT-OS,l3nko/RIOT,beurdouche/RIOT,smlng/RIOT,jasonatran/RIOT,yogo1212/RIOT,tfar/RIOT,lebrush/RIOT,dailab/RIOT,dkm/RIOT,kYc0o/RIOT,rousselk/RIOT,lebrush/RIOT,gautric/RIOT,plushvoxel/RIOT,jremmert-phytec-iot/RIOT,brettswann/RIOT,x3ro/RIOT,mtausig/RIOT,mfrey/RIOT,malosek/RIOT,Hyungsin/RIOT-OS,alignan/RIOT,BytesGalore/RIOT,roberthartung/RIOT,lebrush/RIOT,TobiasFredersdorf/RIOT,rfuentess/RIOT,aeneby/RIOT,biboc/RIOT,rousselk/RIOT,alignan/RIOT,rousselk/RIOT,ks156/RIOT,jremmert-phytec-iot/RIOT,OlegHahm/RIOT,lazytech-org/RIOT,zhuoshuguo/RIOT,adrianghc/RIOT,LudwigKnuepfer/RIOT,cladmi/RIOT,mfrey/RIOT,MohmadAyman/RIOT,gebart/RIOT,roberthartung/RIOT,cladmi/RIOT,aeneby/RIOT,kYc0o/RIOT,jremmert-phytec-iot/RIOT,OTAkeys/RIOT,gautric/RIOT,malosek/RIOT,immesys/RiSyn,dailab/RIOT,adjih/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,l3nko/RIOT,hamilton-mote/RIOT-OS,rousselk/RIOT,miri64/RIOT,jasonatran/RIOT,kaspar030/RIOT,Ell-i/RIOT,OlegHahm/RIOT,lebrush/RIOT,rfuentess/RIOT,altairpearl/RIOT,d00616/RIOT,asanka-code/RIOT,x3ro/RIOT,RBartz/RIOT,dailab/RIOT,ant9000/RIOT,jfischer-phytec-iot/RIOT,Yonezawa-T2/RIOT,aeneby/RIOT,yogo1212/RIOT,x3ro/RIOT,tfar/RIOT,kerneltask/RIOT,adrianghc/RIOT,malosek/RIOT,hamilton-mote/RIOT-OS,A-Paul/RIOT,rajma996/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,lazytech-org/RIOT,roberthartung/RIOT,brettswann/RIOT,jbeyerstedt/RIOT-OTA-update,avmelnikoff/RIOT,l3nko/RIOT,asanka-code/RIOT,katezilla/RIOT,Hyungsin/RIOT-OS,altairpearl/RIOT,RubikonAlpha/RIOT,yogo1212/RIOT,FrancescoErmini/RIOT,biboc/RIOT,RIOT-OS/RIOT,kb2ma/RIOT,OTAkeys/RIOT,kaspar030/RIOT,Yonezawa-T2/RIOT,immesys/RiSyn,backenklee/RIOT,immesys/RiSyn,RubikonAlpha/RIOT,jbeyerstedt/RIOT-OTA-update,mziegert/RIOT,beurdouche/RIOT,binarylemon/RIOT,neiljay/RIOT,mfrey/RIOT,tfar/RIOT,basilfx/RIOT,kerneltask/RIOT,avmelnikoff/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,jbeyerstedt/RIOT-OTA-update,LudwigOrtmann/RIOT