Move Cross Platform document to source code control
Move Cross Platform document to source code control

This moves the cross platform instructions to a file checked into
source code control.  This process naturally envolves with our
code and hence should live next to it.

Bonus: External customers can send PRs to fix the many typos and
errors that I keep introducing.

HellBrick/roslyn,KashishArora/Roslyn,agocke/roslyn,bkoelman/roslyn,xoofx/roslyn,FICTURE7/roslyn,xasx/roslyn,VSadov/roslyn,dpoeschl/roslyn,CyrusNajmabadi/roslyn,davkean/roslyn,russpowers/roslyn,drognanar/roslyn,CyrusNajmabadi/roslyn,pdelvo/roslyn,jaredpar/roslyn,yjfxfjch/roslyn,VPashkov/roslyn,KirillOsenkov/roslyn,panopticoncentral/roslyn,grianggrai/roslyn,sharadagrawal/TestProject2,taylorjonl/roslyn,VShangxiao/roslyn,antonssonj/roslyn,sharadagrawal/TestProject2,mattscheffer/roslyn,Hosch250/roslyn,AnthonyDGreen/roslyn,aanshibudhiraja/Roslyn,srivatsn/roslyn,dovzhikova/roslyn,EricArndt/roslyn,cybernet14/roslyn,GuilhermeSa/roslyn,oberxon/roslyn,rchande/roslyn,jasonmalinowski/roslyn,MichalStrehovsky/roslyn,sharwell/roslyn,lorcanmooney/roslyn,yjfxfjch/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,DanielRosenwasser/roslyn,zmaruo/roslyn,FICTURE7/roslyn,VPashkov/roslyn,physhi/roslyn,tang7526/roslyn,mirhagk/roslyn,bartdesmet/roslyn,kuhlenh/roslyn,SeriaWei/roslyn,KevinH-MS/roslyn,TyOverby/roslyn,eriawan/roslyn,chenxizhang/roslyn,moozzyk/roslyn,AlexisArce/roslyn,dotnet/roslyn,cston/roslyn,MihaMarkic/roslyn-prank,Giftednewt/roslyn,oocx/roslyn,garryforreg/roslyn,danielcweber/roslyn,leppie/roslyn,mavasani/roslyn,lorcanmooney/roslyn,AArnott/roslyn,paulvanbrenk/roslyn,stebet/roslyn,TyOverby/roslyn,huoxudong125/roslyn,Inverness/roslyn,mirhagk/roslyn,kuhlenh/roslyn,DanielRosenwasser/roslyn,VShangxiao/roslyn,tannergooding/roslyn,orthoxerox/roslyn,reaction1989/roslyn,Giten2004/roslyn,OmarTawfik/roslyn,RipCurrent/roslyn,sharwell/roslyn,grianggrai/roslyn,khyperia/roslyn,EricArndt/roslyn,oocx/roslyn,vcsjones/roslyn,brettfo/roslyn,BugraC/roslyn,xasx/roslyn,pdelvo/roslyn,CaptainHayashi/roslyn,zooba/roslyn,gafter/roslyn,doconnell565/roslyn,antonssonj/roslyn,droyad/roslyn,mirhagk/roslyn,magicbing/roslyn,supriyantomaftuh/roslyn,tang7526/roslyn,jcouv/roslyn,heejaechang/roslyn,genlu/roslyn,natgla/roslyn,xoofx/roslyn,aanshibudhiraja/Roslyn,gafter/roslyn,MattWindsor91/roslyn,rchande/roslyn,michalhosala/roslyn,MihaMarkic/roslyn-prank,jmarolf/roslyn,CaptainHayashi/roslyn,natidea/roslyn,tvand7093/roslyn,enginekit/roslyn,RipCurrent/roslyn,VitalyTVA/roslyn,OmarTawfik/roslyn,v-codeel/roslyn,dotnet/roslyn,AlexisArce/roslyn,bbarry/roslyn,jonatassaraiva/roslyn,krishnarajbb/roslyn,ValentinRueda/roslyn,HellBrick/roslyn,rchande/roslyn,MichalStrehovsky/roslyn,khyperia/roslyn,aanshibudhiraja/Roslyn,HellBrick/roslyn,ErikSchierboom/roslyn,jcouv/roslyn,OmniSharp/roslyn,khellang/roslyn,tvand7093/roslyn,enginekit/roslyn,mmitche/roslyn,KiloBravoLima/roslyn,jhendrixMSFT/roslyn,kienct89/roslyn,vcsjones/roslyn,droyad/roslyn,sharadagrawal/TestProject2,MichalStrehovsky/roslyn,dotnet/roslyn,MihaMarkic/roslyn-prank,tmeschter/roslyn,mseamari/Stuff,doconnell565/roslyn,agocke/roslyn,aelij/roslyn,MattWindsor91/roslyn,orthoxerox/roslyn,brettfo/roslyn,akrisiun/roslyn,zmaruo/roslyn,REALTOBIZ/roslyn,JakeGinnivan/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,tsdl2013/roslyn,DanielRosenwasser/roslyn,mmitche/roslyn,vslsnap/roslyn,michalhosala/roslyn,YOTOV-LIMITED/roslyn,KamalRathnayake/roslyn,stephentoub/roslyn,Giten2004/roslyn,tannergooding/roslyn,heejaechang/roslyn,yeaicc/roslyn,jkotas/roslyn,3F/roslyn,mgoertz-msft/roslyn,Maxwe11/roslyn,magicbing/roslyn,mgoertz-msft/roslyn,kienct89/roslyn,stjeong/roslyn,tmeschter/roslyn,jcouv/roslyn,brettfo/roslyn,ValentinRueda/roslyn,KiloBravoLima/roslyn,jonatassaraiva/roslyn,chenxizhang/roslyn,moozzyk/roslyn,xasx/roslyn,tmeschter/roslyn,ErikSchierboom/roslyn,mseamari/Stuff,amcasey/roslyn,srivatsn/roslyn,garryforreg/roslyn,VSadov/roslyn,mseamari/Stuff,weltkante/roslyn,KashishArora/Roslyn,jeffanders/roslyn,wvdd007/roslyn,VPashkov/roslyn,evilc0des/roslyn,jroggeman/roslyn,kelltrick/roslyn,moozzyk/roslyn,jamesqo/roslyn,Hosch250/roslyn,aelij/roslyn,tmat/roslyn,jbhensley/roslyn,OmniSharp/roslyn,diryboy/roslyn,VSadov/roslyn,natgla/roslyn,mattwar/roslyn,jhendrixMSFT/roslyn,orthoxerox/roslyn,physhi/roslyn,AmadeusW/roslyn,Inverness/roslyn,panopticoncentral/roslyn,AArnott/roslyn,managed-commons/roslyn,natidea/roslyn,tannergooding/roslyn,kuhlenh/roslyn,GuilhermeSa/roslyn,3F/roslyn,swaroop-sridhar/roslyn,oocx/roslyn,kelltrick/roslyn,zooba/roslyn,budcribar/roslyn,abock/roslyn,genlu/roslyn,krishnarajbb/roslyn,KevinH-MS/roslyn,antiufo/roslyn,jbhensley/roslyn,stephentoub/roslyn,BugraC/roslyn,DustinCampbell/roslyn,MattWindsor91/roslyn,ErikSchierboom/roslyn,ahmedshuhel/roslyn,managed-commons/roslyn,KamalRathnayake/roslyn,OmniSharp/roslyn,huoxudong125/roslyn,tang7526/roslyn,budcribar/roslyn,gafter/roslyn,DustinCampbell/roslyn,taylorjonl/roslyn,jeremymeng/roslyn,jeremymeng/roslyn,ilyes14/roslyn,MatthieuMEZIL/roslyn,Pvlerick/roslyn,diryboy/roslyn,BugraC/roslyn,rgani/roslyn,sharadagrawal/Roslyn,AlekseyTs/roslyn,aelij/roslyn,bkoelman/roslyn,bartdesmet/roslyn,GuilhermeSa/roslyn,ahmedshuhel/roslyn,pjmagee/roslyn,KevinH-MS/roslyn,Shiney/roslyn,xoofx/roslyn,diryboy/roslyn,Pvlerick/roslyn,pjmagee/roslyn,KamalRathnayake/roslyn,robinsedlaczek/roslyn,KevinRansom/roslyn,yjfxfjch/roslyn,panopticoncentral/roslyn,kelltrick/roslyn,Giftednewt/roslyn,pdelvo/roslyn,tvand7093/roslyn,a-ctor/roslyn,jmarolf/roslyn,jeffanders/roslyn,abock/roslyn,antonssonj/roslyn,Shiney/roslyn,AnthonyDGreen/roslyn,AnthonyDGreen/roslyn,amcasey/roslyn,tsdl2013/roslyn,VitalyTVA/roslyn,KevinRansom/roslyn,antiufo/roslyn,vcsjones/roslyn,jonatassaraiva/roslyn,supriyantomaftuh/roslyn,v-codeel/roslyn,stebet/roslyn,thomaslevesque/roslyn,hanu412/roslyn,nguerrera/roslyn,bartdesmet/roslyn,ahmedshuhel/roslyn,taylorjonl/roslyn,poizan42/roslyn,hanu412/roslyn,balajikris/roslyn,stjeong/roslyn,agocke/roslyn,KiloBravoLima/roslyn,robinsedlaczek/roslyn,danielcweber/roslyn,SeriaWei/roslyn,ericfe-ms/roslyn,doconnell565/roslyn,nguerrera/roslyn,pjmagee/roslyn,nemec/roslyn,tsdl2013/roslyn,VShangxiao/roslyn,jroggeman/roslyn,balajikris/roslyn,ValentinRueda/roslyn,mmitche/roslyn,mattscheffer/roslyn,hanu412/roslyn,nemec/roslyn,cston/roslyn,shyamnamboodiripad/roslyn,evilc0des/roslyn,weltkante/roslyn,nagyistoce/roslyn,jkotas/roslyn,weltkante/roslyn,cston/roslyn,EricArndt/roslyn,jrharmon/roslyn,robinsedlaczek/roslyn,stebet/roslyn,jaredpar/roslyn,jroggeman/roslyn,garryforreg/roslyn,antiufo/roslyn,rgani/roslyn,jaredpar/roslyn,AmadeusW/roslyn,DustinCampbell/roslyn,AlekseyTs/roslyn,akrisiun/roslyn,reaction1989/roslyn,zmaruo/roslyn,lisong521/roslyn,MatthieuMEZIL/roslyn,KirillOsenkov/roslyn,russpowers/roslyn,yeaicc/roslyn,AArnott/roslyn,YOTOV-LIMITED/roslyn,danielcweber/roslyn,REALTOBIZ/roslyn,sharadagrawal/Roslyn,khellang/roslyn,jasonmalinowski/roslyn,mattwar/roslyn,grianggrai/roslyn,drognanar/roslyn,ljw1004/roslyn,jbhensley/roslyn,Giftednewt/roslyn,abock/roslyn,huoxudong125/roslyn,jrharmon/roslyn,droyad/roslyn,jeffanders/roslyn,Shiney/roslyn,mattwar/roslyn,vslsnap/roslyn,nemec/roslyn,dovzhikova/roslyn,stjeong/roslyn,leppie/roslyn,basoundr/roslyn,v-codeel/roslyn,SeriaWei/roslyn,nagyistoce/roslyn,3F/roslyn,natidea/roslyn,kienct89/roslyn,eriawan/roslyn,rgani/roslyn,devharis/roslyn,KirillOsenkov/roslyn,jrharmon/roslyn,paulvanbrenk/roslyn,chenxizhang/roslyn,shyamnamboodiripad/roslyn,Inverness/roslyn,mavasani/roslyn,zooba/roslyn,stephentoub/roslyn,eriawan/roslyn,MattWindsor91/roslyn,michalhosala/roslyn,Giten2004/roslyn,ilyes14/roslyn,devharis/roslyn,nagyistoce/roslyn,jmarolf/roslyn,jeremymeng/roslyn,heejaechang/roslyn,bbarry/roslyn,wvdd007/roslyn,AlexisArce/roslyn,dpoeschl/roslyn,lorcanmooney/roslyn,leppie/roslyn,wvdd007/roslyn,CyrusNajmabadi/roslyn,ilyes14/roslyn,akrisiun/roslyn,ljw1004/roslyn,jamesqo/roslyn,cybernet14/roslyn,JakeGinnivan/roslyn,thomaslevesque/roslyn,TyOverby/roslyn,bbarry/roslyn,cybernet14/roslyn,Maxwe11/roslyn,tmat/roslyn,a-ctor/roslyn,physhi/roslyn,dpoeschl/roslyn,VitalyTVA/roslyn,oberxon/roslyn,bkoelman/roslyn,davkean/roslyn,a-ctor/roslyn,mavasani/roslyn,evilc0des/roslyn,JakeGinnivan/roslyn,budcribar/roslyn,tmat/roslyn,jkotas/roslyn,krishnarajbb/roslyn,jasonmalinowski/roslyn,khyperia/roslyn,sharadagrawal/Roslyn,REALTOBIZ/roslyn,sharwell/roslyn,YOTOV-LIMITED/roslyn,swaroop-sridhar/roslyn,AmadeusW/roslyn,KashishArora/Roslyn,RipCurrent/roslyn,mattscheffer/roslyn,drognanar/roslyn,thomaslevesque/roslyn,ericfe-ms/roslyn,lisong521/roslyn,mgoertz-msft/roslyn,oberxon/roslyn,khellang/roslyn,KevinRansom/roslyn,poizan42/roslyn,MatthieuMEZIL/roslyn,davkean/roslyn,devharis/roslyn,basoundr/roslyn,FICTURE7/roslyn,enginekit/roslyn,reaction1989/roslyn,yeaicc/roslyn,swaroop-sridhar/roslyn,dovzhikova/roslyn,vslsnap/roslyn,shyamnamboodiripad/roslyn,jamesqo/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,poizan42/roslyn,amcasey/roslyn,jhendrixMSFT/roslyn,srivatsn/roslyn,Hosch250/roslyn,AlekseyTs/roslyn,ericfe-ms/roslyn,supriyantomaftuh/roslyn,paulvanbrenk/roslyn,basoundr/roslyn,nguerrera/roslyn,Pvlerick/roslyn,balajikris/roslyn,genlu/roslyn,CaptainHayashi/roslyn,natgla/roslyn,magicbing/roslyn,lisong521/roslyn,russpowers/roslyn,OmarTawfik/roslyn,ljw1004/roslyn,managed-commons/roslyn,Maxwe11/roslyn