Improve windows build instructions.
Improve windows build instructions.

Add a command line that installs all required Visual Studio components
as well as Git and Python.

allevato/swift,harlanhaskins/swift,ahoppen/swift,tkremenek/swift,jckarter/swift,JGiola/swift,hooman/swift,harlanhaskins/swift,jckarter/swift,benlangmuir/swift,glessard/swift,harlanhaskins/swift,atrick/swift,allevato/swift,apple/swift,rudkx/swift,allevato/swift,roambotics/swift,tkremenek/swift,stephentyrone/swift,jmgc/swift,apple/swift,harlanhaskins/swift,rudkx/swift,nathawes/swift,CodaFi/swift,parkera/swift,rudkx/swift,stephentyrone/swift,glessard/swift,jmgc/swift,CodaFi/swift,nathawes/swift,parkera/swift,ahoppen/swift,glessard/swift,jckarter/swift,xwu/swift,xwu/swift,stephentyrone/swift,parkera/swift,hooman/swift,hooman/swift,stephentyrone/swift,xwu/swift,airspeedswift/swift,airspeedswift/swift,airspeedswift/swift,atrick/swift,glessard/swift,gregomni/swift,parkera/swift,CodaFi/swift,tkremenek/swift,hooman/swift,jckarter/swift,gregomni/swift,stephentyrone/swift,benlangmuir/swift,CodaFi/swift,gregomni/swift,roambotics/swift,xwu/swift,jckarter/swift,nathawes/swift,tkremenek/swift,parkera/swift,airspeedswift/swift,roambotics/swift,CodaFi/swift,allevato/swift,JGiola/swift,rudkx/swift,CodaFi/swift,parkera/swift,hooman/swift,xwu/swift,roambotics/swift,airspeedswift/swift,nathawes/swift,benlangmuir/swift,airspeedswift/swift,JGiola/swift,atrick/swift,harlanhaskins/swift,JGiola/swift,tkremenek/swift,gregomni/swift,ahoppen/swift,tkremenek/swift,parkera/swift,jmgc/swift,roambotics/swift,glessard/swift,apple/swift,jmgc/swift,harlanhaskins/swift,apple/swift,stephentyrone/swift,apple/swift,gregomni/swift,benlangmuir/swift,atrick/swift,atrick/swift,jmgc/swift,rudkx/swift,nathawes/swift,rudkx/swift,nathawes/swift,xwu/swift,stephentyrone/swift,hooman/swift,tkremenek/swift,allevato/swift,glessard/swift,nathawes/swift,jmgc/swift,apple/swift,airspeedswift/swift,jckarter/swift,CodaFi/swift,roambotics/swift,benlangmuir/swift,xwu/swift,atrick/swift,jmgc/swift,gregomni/swift,ahoppen/swift,ahoppen/swift,ahoppen/swift,JGiola/swift,jckarter/swift,JGiola/swift,allevato/swift,benlangmuir/swift,allevato/swift,harlanhaskins/swift,hooman/swift,parkera/swift