Update contributing.md
Update contributing.md

Added a link to JIT porting guidance
blackdwarf/coreclr,LLITCHEV/coreclr,neurospeech/coreclr,ruben-ayrapetyan/coreclr,JosephTremoulet/coreclr,shahid-pk/coreclr,cshung/coreclr,manu-silicon/coreclr,Godin/coreclr,stormleoxia/coreclr,kyulee1/coreclr,cmckinsey/coreclr,bitcrazed/coreclr,poizan42/coreclr,Lucrecious/coreclr,chuck-mitchell/coreclr,wtgodbe/coreclr,YongseopKim/coreclr,mmitche/coreclr,wateret/coreclr,ramarag/coreclr,Dmitry-Me/coreclr,SlavaRa/coreclr,KrzysztofCwalina/coreclr,Lucrecious/coreclr,botaberg/coreclr,qiudesong/coreclr,mokchhya/coreclr,cydhaselton/coreclr,botaberg/coreclr,ktos/coreclr,dasMulli/coreclr,andschwa/coreclr,blackdwarf/coreclr,James-Ko/coreclr,JosephTremoulet/coreclr,Dmitry-Me/coreclr,stormleoxia/coreclr,chuck-mitchell/coreclr,roncain/coreclr,bartonjs/coreclr,roncain/coreclr,krk/coreclr,martinwoodward/coreclr,naamunds/coreclr,ktos/coreclr,parjong/coreclr,neurospeech/coreclr,yeaicc/coreclr,James-Ko/coreclr,blackdwarf/coreclr,ruben-ayrapetyan/coreclr,LLITCHEV/coreclr,alexperovich/coreclr,cmckinsey/coreclr,James-Ko/coreclr,James-Ko/coreclr,Lucrecious/coreclr,bartdesmet/coreclr,bartdesmet/coreclr,cmckinsey/coreclr,roncain/coreclr,hseok-oh/coreclr,jhendrixMSFT/coreclr,Lucrecious/coreclr,sjsinju/coreclr,parjong/coreclr,sperling/coreclr,botaberg/coreclr,ruben-ayrapetyan/coreclr,gkhanna79/coreclr,James-Ko/coreclr,naamunds/coreclr,manu-silicon/coreclr,Dmitry-Me/coreclr,swgillespie/coreclr,ragmani/coreclr,jamesqo/coreclr,krytarowski/coreclr,manu-silicon/coreclr,gkhanna79/coreclr,hseok-oh/coreclr,mokchhya/coreclr,ktos/coreclr,KrzysztofCwalina/coreclr,ramarag/coreclr,mskvortsov/coreclr,martinwoodward/coreclr,taylorjonl/coreclr,bitcrazed/coreclr,benpye/coreclr,yizhang82/coreclr,mskvortsov/coreclr,tijoytom/coreclr,LLITCHEV/coreclr,ZhichengZhu/coreclr,cmckinsey/coreclr,bartdesmet/coreclr,sperling/coreclr,chuck-mitchell/coreclr,cydhaselton/coreclr,josteink/coreclr,cydhaselton/coreclr,ragmani/coreclr,taylorjonl/coreclr,AlexGhiondea/coreclr,mskvortsov/coreclr,pgavlin/coreclr,vinnyrom/coreclr,JosephTremoulet/coreclr,neurospeech/coreclr,kyulee1/coreclr,mocsy/coreclr,poizan42/coreclr,jhendrixMSFT/coreclr,mmitche/coreclr,kyulee1/coreclr,cshung/coreclr,ragmani/coreclr,cydhaselton/coreclr,blackdwarf/coreclr,naamunds/coreclr,yeaicc/coreclr,stormleoxia/coreclr,sjsinju/coreclr,martinwoodward/coreclr,KrzysztofCwalina/coreclr,YongseopKim/coreclr,martinwoodward/coreclr,bitcrazed/coreclr,wtgodbe/coreclr,jamesqo/coreclr,krk/coreclr,ruben-ayrapetyan/coreclr,tijoytom/coreclr,gkhanna79/coreclr,mskvortsov/coreclr,andschwa/coreclr,russellhadley/coreclr,mmitche/coreclr,yizhang82/coreclr,taylorjonl/coreclr,dasMulli/coreclr,mocsy/coreclr,KrzysztofCwalina/coreclr,chuck-mitchell/coreclr,chuck-mitchell/coreclr,naamunds/coreclr,andschwa/coreclr,botaberg/coreclr,josteink/coreclr,shahid-pk/coreclr,dpodder/coreclr,schellap/coreclr,sperling/coreclr,taylorjonl/coreclr,ZhichengZhu/coreclr,martinwoodward/coreclr,josteink/coreclr,sjsinju/coreclr,wtgodbe/coreclr,botaberg/coreclr,jamesqo/coreclr,JonHanna/coreclr,sejongoh/coreclr,AlexGhiondea/coreclr,alexperovich/coreclr,yizhang82/coreclr,wateret/coreclr,cmckinsey/coreclr,jhendrixMSFT/coreclr,stormleoxia/coreclr,Lucrecious/coreclr,JosephTremoulet/coreclr,neurospeech/coreclr,bartonjs/coreclr,kyulee1/coreclr,YongseopKim/coreclr,gkhanna79/coreclr,LLITCHEV/coreclr,swgillespie/coreclr,ZhichengZhu/coreclr,YongseopKim/coreclr,cydhaselton/coreclr,yeaicc/coreclr,ramarag/coreclr,sejongoh/coreclr,yeaicc/coreclr,sagood/coreclr,manu-silicon/coreclr,swgillespie/coreclr,sjsinju/coreclr,sperling/coreclr,taylorjonl/coreclr,ramarag/coreclr,bartonjs/coreclr,mokchhya/coreclr,ktos/coreclr,vinnyrom/coreclr,wkchoy74/coreclr,mocsy/coreclr,bitcrazed/coreclr,Godin/coreclr,rartemev/coreclr,dpodder/coreclr,benpye/coreclr,mskvortsov/coreclr,Godin/coreclr,SlavaRa/coreclr,wkchoy74/coreclr,krk/coreclr,andschwa/coreclr,tijoytom/coreclr,KrzysztofCwalina/coreclr,Godin/coreclr,tijoytom/coreclr,krk/coreclr,alexperovich/coreclr,shahid-pk/coreclr,ramarag/coreclr,ramarag/coreclr,schellap/coreclr,AlexGhiondea/coreclr,naamunds/coreclr,sperling/coreclr,hseok-oh/coreclr,jamesqo/coreclr,schellap/coreclr,wkchoy74/coreclr,SlavaRa/coreclr,tijoytom/coreclr,mmitche/coreclr,krk/coreclr,andschwa/coreclr,sejongoh/coreclr,bartonjs/coreclr,Lucrecious/coreclr,wateret/coreclr,cshung/coreclr,martinwoodward/coreclr,mokchhya/coreclr,roncain/coreclr,jhendrixMSFT/coreclr,yizhang82/coreclr,Godin/coreclr,bitcrazed/coreclr,schellap/coreclr,cshung/coreclr,Dmitry-Me/coreclr,rartemev/coreclr,rartemev/coreclr,vinnyrom/coreclr,ragmani/coreclr,vinnyrom/coreclr,Godin/coreclr,cshung/coreclr,sperling/coreclr,qiudesong/coreclr,pgavlin/coreclr,SlavaRa/coreclr,yizhang82/coreclr,JonHanna/coreclr,dpodder/coreclr,krytarowski/coreclr,ruben-ayrapetyan/coreclr,stormleoxia/coreclr,sejongoh/coreclr,qiudesong/coreclr,krytarowski/coreclr,chuck-mitchell/coreclr,blackdwarf/coreclr,parjong/coreclr,YongseopKim/coreclr,wtgodbe/coreclr,yeaicc/coreclr,roncain/coreclr,KrzysztofCwalina/coreclr,russellhadley/coreclr,roncain/coreclr,rartemev/coreclr,mocsy/coreclr,ruben-ayrapetyan/coreclr,ragmani/coreclr,josteink/coreclr,kyulee1/coreclr,kyulee1/coreclr,poizan42/coreclr,bartdesmet/coreclr,wkchoy74/coreclr,ZhichengZhu/coreclr,sejongoh/coreclr,JosephTremoulet/coreclr,JonHanna/coreclr,shahid-pk/coreclr,mocsy/coreclr,neurospeech/coreclr,russellhadley/coreclr,yizhang82/coreclr,russellhadley/coreclr,jamesqo/coreclr,alexperovich/coreclr,mocsy/coreclr,parjong/coreclr,sejongoh/coreclr,AlexGhiondea/coreclr,wateret/coreclr,martinwoodward/coreclr,KrzysztofCwalina/coreclr,shahid-pk/coreclr,bartonjs/coreclr,krk/coreclr,Dmitry-Me/coreclr,poizan42/coreclr,jhendrixMSFT/coreclr,ZhichengZhu/coreclr,ZhichengZhu/coreclr,hseok-oh/coreclr,parjong/coreclr,wkchoy74/coreclr,swgillespie/coreclr,sagood/coreclr,dpodder/coreclr,parjong/coreclr,Dmitry-Me/coreclr,dasMulli/coreclr,ragmani/coreclr,benpye/coreclr,LLITCHEV/coreclr,tijoytom/coreclr,dasMulli/coreclr,YongseopKim/coreclr,yeaicc/coreclr,vinnyrom/coreclr,swgillespie/coreclr,LLITCHEV/coreclr,mokchhya/coreclr,Lucrecious/coreclr,vinnyrom/coreclr,swgillespie/coreclr,wkchoy74/coreclr,pgavlin/coreclr,cshung/coreclr,mmitche/coreclr,qiudesong/coreclr,SlavaRa/coreclr,ktos/coreclr,swgillespie/coreclr,alexperovich/coreclr,bartonjs/coreclr,JonHanna/coreclr,ktos/coreclr,dpodder/coreclr,alexperovich/coreclr,krytarowski/coreclr,sjsinju/coreclr,James-Ko/coreclr,josteink/coreclr,naamunds/coreclr,sperling/coreclr,benpye/coreclr,Godin/coreclr,dasMulli/coreclr,cydhaselton/coreclr,krytarowski/coreclr,bitcrazed/coreclr,botaberg/coreclr,manu-silicon/coreclr,qiudesong/coreclr,dasMulli/coreclr,sejongoh/coreclr,hseok-oh/coreclr,bitcrazed/coreclr,Dmitry-Me/coreclr,AlexGhiondea/coreclr,qiudesong/coreclr,roncain/coreclr,bartdesmet/coreclr,josteink/coreclr,cmckinsey/coreclr,mokchhya/coreclr,ktos/coreclr,taylorjonl/coreclr,jamesqo/coreclr,JosephTremoulet/coreclr,blackdwarf/coreclr,gkhanna79/coreclr,bartonjs/coreclr,sagood/coreclr,benpye/coreclr,cmckinsey/coreclr,mskvortsov/coreclr,sagood/coreclr,chuck-mitchell/coreclr,blackdwarf/coreclr,shahid-pk/coreclr,rartemev/coreclr,gkhanna79/coreclr,yeaicc/coreclr,poizan42/coreclr,AlexGhiondea/coreclr,schellap/coreclr,josteink/coreclr,andschwa/coreclr,pgavlin/coreclr,neurospeech/coreclr,JonHanna/coreclr,benpye/coreclr,poizan42/coreclr,hseok-oh/coreclr,stormleoxia/coreclr,dasMulli/coreclr,wateret/coreclr,sagood/coreclr,jhendrixMSFT/coreclr,sagood/coreclr,mocsy/coreclr,sjsinju/coreclr,naamunds/coreclr,vinnyrom/coreclr,ramarag/coreclr,rartemev/coreclr,bartdesmet/coreclr,stormleoxia/coreclr,SlavaRa/coreclr,mokchhya/coreclr,manu-silicon/coreclr,andschwa/coreclr,benpye/coreclr,krytarowski/coreclr,wkchoy74/coreclr,jhendrixMSFT/coreclr,mmitche/coreclr,pgavlin/coreclr,schellap/coreclr,taylorjonl/coreclr,russellhadley/coreclr,schellap/coreclr,manu-silicon/coreclr,shahid-pk/coreclr,pgavlin/coreclr,JonHanna/coreclr,bartdesmet/coreclr,LLITCHEV/coreclr,wtgodbe/coreclr,russellhadley/coreclr,wtgodbe/coreclr,ZhichengZhu/coreclr,dpodder/coreclr,wateret/coreclr