windows: Add README with basic cross-compile instructions.
windows: Add README with basic cross-compile instructions.

turbinenreiter/micropython,hiway/micropython,pozetroninc/micropython,stonegithubs/micropython,tobbad/micropython,jimkmc/micropython,supergis/micropython,torwag/micropython,pfalcon/micropython,MrSurly/micropython-esp32,xhat/micropython,MrSurly/micropython,mgyenik/micropython,xhat/micropython,dmazzella/micropython,SHA2017-badge/micropython-esp32,vriera/micropython,neilh10/micropython,swegener/micropython,ryannathans/micropython,dinau/micropython,vriera/micropython,drrk/micropython,pozetroninc/micropython,PappaPeppar/micropython,hiway/micropython,trezor/micropython,tralamazza/micropython,warner83/micropython,utopiaprince/micropython,rubencabrera/micropython,danicampora/micropython,galenhz/micropython,micropython/micropython-esp32,noahwilliamsson/micropython,trezor/micropython,jimkmc/micropython,aethaniel/micropython,methoxid/micropystat,jmarcelino/pycom-micropython,Peetz0r/micropython-esp32,tobbad/micropython,ahotam/micropython,Peetz0r/micropython-esp32,vriera/micropython,xuxiaoxin/micropython,Timmenem/micropython,swegener/micropython,galenhz/micropython,infinnovation/micropython,mhoffma/micropython,EcmaXp/micropython,noahwilliamsson/micropython,adafruit/micropython,chrisdearman/micropython,trezor/micropython,cloudformdesign/micropython,pfalcon/micropython,adafruit/micropython,firstval/micropython,MrSurly/micropython-esp32,tdautc19841202/micropython,torwag/micropython,henriknelson/micropython,KISSMonX/micropython,micropython/micropython-esp32,noahchense/micropython,drrk/micropython,infinnovation/micropython,matthewelse/micropython,adamkh/micropython,pozetroninc/micropython,utopiaprince/micropython,ganshun666/micropython,slzatz/micropython,hiway/micropython,emfcamp/micropython,jmarcelino/pycom-micropython,dmazzella/micropython,feilongfl/micropython,SHA2017-badge/micropython-esp32,mgyenik/micropython,xuxiaoxin/micropython,dinau/micropython,oopy/micropython,stonegithubs/micropython,praemdonck/micropython,xhat/micropython,puuu/micropython,blazewicz/micropython,aethaniel/micropython,utopiaprince/micropython,hosaka/micropython,lbattraw/micropython,mgyenik/micropython,pfalcon/micropython,deshipu/micropython,ahotam/micropython,cnoviello/micropython,emfcamp/micropython,AriZuu/micropython,adafruit/micropython,dxxb/micropython,tobbad/micropython,AriZuu/micropython,kostyll/micropython,deshipu/micropython,mhoffma/micropython,cwyark/micropython,puuu/micropython,xhat/micropython,kerneltask/micropython,toolmacher/micropython,paul-xxx/micropython,mianos/micropython,ceramos/micropython,tuc-osg/micropython,utopiaprince/micropython,EcmaXp/micropython,ChuckM/micropython,ericsnowcurrently/micropython,adamkh/micropython,ahotam/micropython,Vogtinator/micropython,bvernoux/micropython,tralamazza/micropython,dhylands/micropython,MrSurly/micropython-esp32,SungEun-Steve-Kim/test-mp,ceramos/micropython,SungEun-Steve-Kim/test-mp,praemdonck/micropython,noahchense/micropython,jmarcelino/pycom-micropython,xyb/micropython,HenrikSolver/micropython,ryannathans/micropython,MrSurly/micropython-esp32,skybird6672/micropython,toolmacher/micropython,tuc-osg/micropython,warner83/micropython,neilh10/micropython,orionrobots/micropython,lowRISC/micropython,aethaniel/micropython,oopy/micropython,jmarcelino/pycom-micropython,swegener/micropython,matthewelse/micropython,utopiaprince/micropython,stonegithubs/micropython,ceramos/micropython,Timmenem/micropython,mianos/micropython,AriZuu/micropython,adafruit/circuitpython,hosaka/micropython,micropython/micropython-esp32,cloudformdesign/micropython,lowRISC/micropython,infinnovation/micropython,supergis/micropython,Timmenem/micropython,blazewicz/micropython,rubencabrera/micropython,martinribelotta/micropython,HenrikSolver/micropython,ericsnowcurrently/micropython,heisewangluo/micropython,SungEun-Steve-Kim/test-mp,firstval/micropython,noahwilliamsson/micropython,mpalomer/micropython,bvernoux/micropython,pozetroninc/micropython,danicampora/micropython,henriknelson/micropython,vitiral/micropython,tdautc19841202/micropython,Peetz0r/micropython-esp32,bvernoux/micropython,tdautc19841202/micropython,puuu/micropython,cloudformdesign/micropython,alex-march/micropython,mhoffma/micropython,heisewangluo/micropython,lowRISC/micropython,mianos/micropython,orionrobots/micropython,dhylands/micropython,vriera/micropython,orionrobots/micropython,suda/micropython,hosaka/micropython,chrisdearman/micropython,jlillest/micropython,tobbad/micropython,redbear/micropython,noahwilliamsson/micropython,stonegithubs/micropython,adafruit/micropython,adafruit/circuitpython,omtinez/micropython,jlillest/micropython,paul-xxx/micropython,ceramos/micropython,tuc-osg/micropython,feilongfl/micropython,firstval/micropython,ChuckM/micropython,selste/micropython,misterdanb/micropython,ruffy91/micropython,dxxb/micropython,martinribelotta/micropython,omtinez/micropython,firstval/micropython,turbinenreiter/micropython,tdautc19841202/micropython,EcmaXp/micropython,toolmacher/micropython,xuxiaoxin/micropython,MrSurly/micropython,adafruit/circuitpython,Vogtinator/micropython,skybird6672/micropython,neilh10/micropython,mpalomer/micropython,chrisdearman/micropython,oopy/micropython,praemdonck/micropython,alex-robbins/micropython,PappaPeppar/micropython,henriknelson/micropython,martinribelotta/micropython,firstval/micropython,methoxid/micropystat,feilongfl/micropython,heisewangluo/micropython,galenhz/micropython,hiway/micropython,ernesto-g/micropython,bvernoux/micropython,redbear/micropython,feilongfl/micropython,alex-march/micropython,ernesto-g/micropython,suda/micropython,micropython/micropython-esp32,mpalomer/micropython,warner83/micropython,danicampora/micropython,Timmenem/micropython,emfcamp/micropython,blmorris/micropython,ericsnowcurrently/micropython,skybird6672/micropython,cwyark/micropython,pfalcon/micropython,mgyenik/micropython,ruffy91/micropython,emfcamp/micropython,supergis/micropython,tobbad/micropython,infinnovation/micropython,PappaPeppar/micropython,blazewicz/micropython,kostyll/micropython,blmorris/micropython,lbattraw/micropython,skybird6672/micropython,adafruit/circuitpython,hosaka/micropython,turbinenreiter/micropython,warner83/micropython,matthewelse/micropython,cnoviello/micropython,galenhz/micropython,kerneltask/micropython,SHA2017-badge/micropython-esp32,cloudformdesign/micropython,blazewicz/micropython,neilh10/micropython,pramasoul/micropython,praemdonck/micropython,toolmacher/micropython,kostyll/micropython,swegener/micropython,alex-robbins/micropython,dmazzella/micropython,pramasoul/micropython,adamkh/micropython,MrSurly/micropython,alex-robbins/micropython,methoxid/micropystat,micropython/micropython-esp32,blmorris/micropython,martinribelotta/micropython,blmorris/micropython,trezor/micropython,adafruit/circuitpython,jimkmc/micropython,mhoffma/micropython,henriknelson/micropython,danicampora/micropython,selste/micropython,cloudformdesign/micropython,mpalomer/micropython,vriera/micropython,toolmacher/micropython,pramasoul/micropython,paul-xxx/micropython,mhoffma/micropython,feilongfl/micropython,cwyark/micropython,selste/micropython,rubencabrera/micropython,henriknelson/micropython,pramasoul/micropython,alex-robbins/micropython,tdautc19841202/micropython,torwag/micropython,Vogtinator/micropython,vitiral/micropython,alex-robbins/micropython,AriZuu/micropython,adafruit/circuitpython,blazewicz/micropython,drrk/micropython,Peetz0r/micropython-esp32,pozetroninc/micropython,emfcamp/micropython,matthewelse/micropython,slzatz/micropython,drrk/micropython,AriZuu/micropython,ryannathans/micropython,danicampora/micropython,ganshun666/micropython,rubencabrera/micropython,Vogtinator/micropython,ruffy91/micropython,infinnovation/micropython,methoxid/micropystat,noahchense/micropython,jlillest/micropython,ahotam/micropython,adamkh/micropython,oopy/micropython,galenhz/micropython,lowRISC/micropython,paul-xxx/micropython,jlillest/micropython,HenrikSolver/micropython,lbattraw/micropython,HenrikSolver/micropython,TDAbboud/micropython,misterdanb/micropython,kostyll/micropython,dinau/micropython,ruffy91/micropython,jlillest/micropython,alex-march/micropython,trezor/micropython,dhylands/micropython,ericsnowcurrently/micropython,ganshun666/micropython,redbear/micropython,EcmaXp/micropython,MrSurly/micropython,alex-march/micropython,paul-xxx/micropython,pramasoul/micropython,MrSurly/micropython,omtinez/micropython,SungEun-Steve-Kim/test-mp,dmazzella/micropython,hosaka/micropython,xyb/micropython,supergis/micropython,tuc-osg/micropython,deshipu/micropython,xhat/micropython,skybird6672/micropython,blmorris/micropython,oopy/micropython,dinau/micropython,suda/micropython,bvernoux/micropython,ChuckM/micropython,redbear/micropython,puuu/micropython,dxxb/micropython,jimkmc/micropython,turbinenreiter/micropython,xyb/micropython,redbear/micropython,ryannathans/micropython,dxxb/micropython,kerneltask/micropython,lbattraw/micropython,omtinez/micropython,ernesto-g/micropython,praemdonck/micropython,deshipu/micropython,ruffy91/micropython,swegener/micropython,xyb/micropython,TDAbboud/micropython,puuu/micropython,KISSMonX/micropython,kostyll/micropython,tralamazza/micropython,misterdanb/micropython,selste/micropython,lbattraw/micropython,ceramos/micropython,dhylands/micropython,TDAbboud/micropython,ahotam/micropython,drrk/micropython,selste/micropython,tralamazza/micropython,orionrobots/micropython,cnoviello/micropython,slzatz/micropython,aethaniel/micropython,matthewelse/micropython,KISSMonX/micropython,hiway/micropython,jmarcelino/pycom-micropython,ChuckM/micropython,deshipu/micropython,chrisdearman/micropython,slzatz/micropython,ChuckM/micropython,dinau/micropython,xyb/micropython,matthewelse/micropython,heisewangluo/micropython,Peetz0r/micropython-esp32,noahwilliamsson/micropython,cwyark/micropython,tuc-osg/micropython,misterdanb/micropython,neilh10/micropython,jimkmc/micropython,noahchense/micropython,suda/micropython,heisewangluo/micropython,PappaPeppar/micropython,xuxiaoxin/micropython,kerneltask/micropython,slzatz/micropython,lowRISC/micropython,EcmaXp/micropython,dxxb/micropython,ernesto-g/micropython,ernesto-g/micropython,PappaPeppar/micropython,adafruit/micropython,xuxiaoxin/micropython,torwag/micropython,TDAbboud/micropython,martinribelotta/micropython,adamkh/micropython,cwyark/micropython,KISSMonX/micropython,vitiral/micropython,vitiral/micropython,Timmenem/micropython,torwag/micropython,omtinez/micropython,stonegithubs/micropython,ganshun666/micropython,SungEun-Steve-Kim/test-mp,ryannathans/micropython,supergis/micropython,noahchense/micropython,dhylands/micropython,methoxid/micropystat,pfalcon/micropython,cnoviello/micropython,ericsnowcurrently/micropython,rubencabrera/micropython,mianos/micropython,mgyenik/micropython,SHA2017-badge/micropython-esp32,KISSMonX/micropython,kerneltask/micropython,turbinenreiter/micropython,suda/micropython,TDAbboud/micropython,aethaniel/micropython,SHA2017-badge/micropython-esp32,misterdanb/micropython,vitiral/micropython,Vogtinator/micropython,MrSurly/micropython-esp32,alex-march/micropython,mianos/micropython,warner83/micropython,cnoviello/micropython,chrisdearman/micropython,HenrikSolver/micropython,orionrobots/micropython,ganshun666/micropython,mpalomer/micropython