[docs] Add a quick doc for the CI that initially just contain information about @swift-ci.
[docs] Add a quick doc for the CI that initially just contain information about @swift-ci.

This documentation is also in the PR template, but many people do not read the
PR template...

aschwaighofer/swift,gmilos/swift,rudkx/swift,airspeedswift/swift,CodaFi/swift,parkera/swift,xwu/swift,benlangmuir/swift,ben-ng/swift,kstaring/swift,OscarSwanros/swift,hughbe/swift,tjw/swift,jckarter/swift,danielmartin/swift,uasys/swift,kstaring/swift,austinzheng/swift,tinysun212/swift-windows,lorentey/swift,codestergit/swift,tjw/swift,shajrawi/swift,arvedviehweger/swift,huonw/swift,shajrawi/swift,kstaring/swift,gregomni/swift,harlanhaskins/swift,rudkx/swift,huonw/swift,Jnosh/swift,practicalswift/swift,practicalswift/swift,jopamer/swift,manavgabhawala/swift,bitjammer/swift,frootloops/swift,tkremenek/swift,parkera/swift,xedin/swift,CodaFi/swift,return/swift,JaSpa/swift,codestergit/swift,bitjammer/swift,gribozavr/swift,atrick/swift,milseman/swift,xwu/swift,felix91gr/swift,gmilos/swift,swiftix/swift,stephentyrone/swift,apple/swift,djwbrown/swift,huonw/swift,gmilos/swift,gregomni/swift,tinysun212/swift-windows,karwa/swift,gribozavr/swift,parkera/swift,austinzheng/swift,hughbe/swift,frootloops/swift,swiftix/swift,nathawes/swift,gottesmm/swift,alblue/swift,codestergit/swift,manavgabhawala/swift,airspeedswift/swift,kstaring/swift,devincoughlin/swift,danielmartin/swift,parkera/swift,arvedviehweger/swift,manavgabhawala/swift,hughbe/swift,bitjammer/swift,OscarSwanros/swift,Jnosh/swift,jckarter/swift,djwbrown/swift,tkremenek/swift,zisko/swift,therealbnut/swift,gottesmm/swift,sschiau/swift,sschiau/swift,stephentyrone/swift,JGiola/swift,nathawes/swift,rudkx/swift,hughbe/swift,gregomni/swift,ben-ng/swift,karwa/swift,natecook1000/swift,manavgabhawala/swift,gmilos/swift,benlangmuir/swift,airspeedswift/swift,karwa/swift,aschwaighofer/swift,shajrawi/swift,karwa/swift,devincoughlin/swift,gmilos/swift,ben-ng/swift,harlanhaskins/swift,modocache/swift,Jnosh/swift,therealbnut/swift,tinysun212/swift-windows,austinzheng/swift,hughbe/swift,austinzheng/swift,deyton/swift,IngmarStein/swift,OscarSwanros/swift,jmgc/swift,OscarSwanros/swift,danielmartin/swift,ahoppen/swift,atrick/swift,therealbnut/swift,karwa/swift,gottesmm/swift,nathawes/swift,amraboelela/swift,OscarSwanros/swift,aschwaighofer/swift,ahoppen/swift,natecook1000/swift,kperryua/swift,benlangmuir/swift,xwu/swift,allevato/swift,deyton/swift,IngmarStein/swift,jtbandes/swift,danielmartin/swift,tardieu/swift,CodaFi/swift,shajrawi/swift,return/swift,IngmarStein/swift,roambotics/swift,austinzheng/swift,jtbandes/swift,ben-ng/swift,deyton/swift,tardieu/swift,kstaring/swift,glessard/swift,stephentyrone/swift,alblue/swift,lorentey/swift,devincoughlin/swift,tinysun212/swift-windows,shahmishal/swift,gmilos/swift,swiftix/swift,alblue/swift,airspeedswift/swift,shahmishal/swift,kperryua/swift,jtbandes/swift,apple/swift,bitjammer/swift,djwbrown/swift,amraboelela/swift,codestergit/swift,deyton/swift,JGiola/swift,tkremenek/swift,tkremenek/swift,kperryua/swift,zisko/swift,djwbrown/swift,allevato/swift,aschwaighofer/swift,aschwaighofer/swift,danielmartin/swift,austinzheng/swift,parkera/swift,rudkx/swift,shahmishal/swift,bitjammer/swift,sschiau/swift,airspeedswift/swift,JaSpa/swift,calebd/swift,brentdax/swift,practicalswift/swift,lorentey/swift,IngmarStein/swift,arvedviehweger/swift,hooman/swift,deyton/swift,gribozavr/swift,karwa/swift,CodaFi/swift,brentdax/swift,therealbnut/swift,harlanhaskins/swift,hooman/swift,CodaFi/swift,benlangmuir/swift,jmgc/swift,shajrawi/swift,JaSpa/swift,devincoughlin/swift,roambotics/swift,return/swift,uasys/swift,brentdax/swift,Jnosh/swift,ahoppen/swift,arvedviehweger/swift,harlanhaskins/swift,calebd/swift,gribozavr/swift,hughbe/swift,bitjammer/swift,allevato/swift,tkremenek/swift,xedin/swift,felix91gr/swift,parkera/swift,tjw/swift,ahoppen/swift,djwbrown/swift,milseman/swift,lorentey/swift,glessard/swift,modocache/swift,CodaFi/swift,gottesmm/swift,glessard/swift,jtbandes/swift,CodaFi/swift,djwbrown/swift,jopamer/swift,huonw/swift,natecook1000/swift,amraboelela/swift,tjw/swift,alblue/swift,IngmarStein/swift,apple/swift,modocache/swift,JGiola/swift,zisko/swift,stephentyrone/swift,shahmishal/swift,kstaring/swift,brentdax/swift,deyton/swift,uasys/swift,frootloops/swift,shajrawi/swift,airspeedswift/swift,practicalswift/swift,kperryua/swift,jopamer/swift,natecook1000/swift,atrick/swift,gmilos/swift,uasys/swift,stephentyrone/swift,apple/swift,xwu/swift,zisko/swift,arvedviehweger/swift,JaSpa/swift,gribozavr/swift,kperryua/swift,JGiola/swift,felix91gr/swift,tjw/swift,jckarter/swift,calebd/swift,zisko/swift,frootloops/swift,ben-ng/swift,kstaring/swift,tjw/swift,return/swift,hooman/swift,alblue/swift,ben-ng/swift,milseman/swift,gribozavr/swift,lorentey/swift,jopamer/swift,tinysun212/swift-windows,Jnosh/swift,deyton/swift,gregomni/swift,kperryua/swift,gregomni/swift,karwa/swift,benlangmuir/swift,allevato/swift,manavgabhawala/swift,atrick/swift,apple/swift,jopamer/swift,jopamer/swift,frootloops/swift,benlangmuir/swift,alblue/swift,xedin/swift,practicalswift/swift,jmgc/swift,frootloops/swift,devincoughlin/swift,hooman/swift,alblue/swift,return/swift,milseman/swift,OscarSwanros/swif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