Create CONTRIBUTING.md
Create CONTRIBUTING.md

Initial stab at creating a contributor's guide
QuantConnect/Lean,JKarathiya/Lean,devalkeralia/Lean,AnshulYADAV007/Lean,tzaavi/Lean,bdilber/Lean,Phoenix1271/Lean,redmeros/Lean,bdilber/Lean,bizcad/LeanAbhi,young-zhang/Lean,AnshulYADAV007/Lean,rchien/Lean,redmeros/Lean,tomhunter-gh/Lean,desimonk/Lean,redmeros/Lean,Phoenix1271/Lean,kaffeebrauer/Lean,StefanoRaggi/Lean,squideyes/Lean,wowgeeker/Lean,bizcad/Lean,bdilber/Lean,bizcad/LeanAbhi,Jay-Jay-D/LeanSTP,redmeros/Lean,squideyes/Lean,Obawoba/Lean,JKarathiya/Lean,StefanoRaggi/Lean,QuantConnect/Lean,devalkeralia/Lean,kaffeebrauer/Lean,florentchandelier/Lean,bizcad/LeanAbhi,FrancisGauthier/Lean,rchien/Lean,iamkingmaker/Lean,exhau/Lean,jameschch/Lean,Jay-Jay-D/LeanSTP,racksen/Lean,racksen/Lean,tzaavi/Lean,wowgeeker/Lean,florentchandelier/Lean,bdilber/Lean,FrancisGauthier/Lean,andrewhart098/Lean,dalebrubaker/Lean,racksen/Lean,wowgeeker/Lean,andrewhart098/Lean,StefanoRaggi/Lean,jameschch/Lean,florentchandelier/Lean,FrancisGauthier/Lean,Mendelone/forex_trading,bizcad/LeanJJN,AlexCatarino/Lean,jameschch/Lean,devalkeralia/Lean,StefanoRaggi/Lean,jameschch/Lean,kaffeebrauer/Lean,squideyes/Lean,squideyes/Lean,a-hart/Lean,Mendelone/forex_trading,tomhunter-gh/Lean,Mendelone/forex_trading,devalkeralia/Lean,Neoracle/Lean,mabeale/Lean,dpavlenkov/Lean,bizcad/LeanITrend,jameschch/Lean,tzaavi/Lean,Jay-Jay-D/LeanSTP,AnObfuscator/Lean,dpavlenkov/Lean,dpavlenkov/Lean,kaffeebrauer/Lean,mabeale/Lean,FrancisGauthier/Lean,desimonk/Lean,iamkingmaker/Lean,AlexCatarino/Lean,kaffeebrauer/Lean,rchien/Lean,AnObfuscator/Lean,Phoenix1271/Lean,Jay-Jay-D/LeanSTP,Neoracle/Lean,tzaavi/Lean,bizcad/LeanITrend,QuantConnect/Lean,Neoracle/Lean,young-zhang/Lean,exhau/Lean,exhau/Lean,exhau/Lean,rchien/Lean,dalebrubaker/Lean,desimonk/Lean,AnshulYADAV007/Lean,AnObfuscator/Lean,andrewhart098/Lean,bizcad/Lean,tomhunter-gh/Lean,StefanoRaggi/Lean,JKarathiya/Lean,bizcad/LeanAbhi,AnshulYADAV007/Lean,bizcad/LeanJJN,Jay-Jay-D/LeanSTP,young-zhang/Lean,bizcad/LeanJJN,Obawoba/Lean,Obawoba/Lean,Phoenix1271/Lean,wowgeeker/Lean,AlexCatarino/Lean,Mendelone/forex_trading,bizcad/Lean,Obawoba/Lean,tomhunter-gh/Lean,dalebrubaker/Lean,young-zhang/Lean,AlexCatarino/Lean,dalebrubaker/Lean,QuantConnect/Lean,bizcad/LeanJJN,iamkingmaker/Lean,desimonk/Lean,mabeale/Lean,Neoracle/Lean,florentchandelier/Lean,bizcad/LeanITrend,racksen/Lean,JKarathiya/Lean,AnshulYADAV007/Lean,iamkingmaker/Lean,bizcad/Lean,andrewhart098/Lean,bizcad/LeanITrend,mabeale/Lean,a-hart/Lean,AnObfuscator/Lean,dpavlenkov/Lean