Update COMPILING.md
Update COMPILING.md

Added instructions for Windows compiling, including CMake.
birkett/cuberite,linnemannr/MCServer,kevinr/cuberite,mc-server/MCServer,Fighter19/cuberite,zackp30/cuberite,Fighter19/cuberite,Haxi52/cuberite,nounoursheureux/MCServer,birkett/cuberite,mmdk95/cuberite,zackp30/cuberite,linnemannr/MCServer,linnemannr/MCServer,QUSpilPrgm/cuberite,nichwall/cuberite,bendl/cuberite,nevercast/cuberite,Tri125/MCServer,electromatter/cuberite,mmdk95/cuberite,nicodinh/cuberite,jammet/MCServer,Tri125/MCServer,marvinkopf/cuberite,jammet/MCServer,Fighter19/cuberite,nevercast/cuberite,birkett/MCServer,mc-server/MCServer,nicodinh/cuberite,thetaeo/cuberite,birkett/MCServer,birkett/MCServer,marvinkopf/cuberite,Schwertspize/cuberite,SamOatesPlugins/cuberite,ionux/MCServer,mjssw/cuberite,guijun/MCServer,Haxi52/cuberite,Fighter19/cuberite,marvinkopf/cuberite,nichwall/cuberite,Frownigami1/cuberite,ionux/MCServer,johnsoch/cuberite,nicodinh/cuberite,nounoursheureux/MCServer,guijun/MCServer,mc-server/MCServer,QUSpilPrgm/cuberite,birkett/MCServer,johnsoch/cuberite,nicodinh/cuberite,zackp30/cuberite,QUSpilPrgm/cuberite,birkett/MCServer,nevercast/cuberite,mc-server/MCServer,nicodinh/cuberite,MuhammadWang/MCServer,Altenius/cuberite,Fighter19/cuberite,Tri125/MCServer,jammet/MCServer,thetaeo/cuberite,SamOatesPlugins/cuberite,Howaner/MCServer,tonibm19/cuberite,mjssw/cuberite,Tri125/MCServer,ionux/MCServer,mmdk95/cuberite,bendl/cuberite,birkett/cuberite,Frownigami1/cuberite,Haxi52/cuberite,nounoursheureux/MCServer,mjssw/cuberite,ionux/MCServer,HelenaKitty/EbooMC,electromatter/cuberite,bendl/cuberite,nichwall/cuberite,jammet/MCServer,nounoursheureux/MCServer,mjssw/cuberite,nichwall/cuberite,QUSpilPrgm/cuberite,SamOatesPlugins/cuberite,thetaeo/cuberite,Haxi52/cuberite,Frownigami1/cuberite,tonibm19/cuberite,nicodinh/cuberite,Schwertspize/cuberite,electromatter/cuberite,birkett/MCServer,QUSpilPrgm/cuberite,kevinr/cuberite,mc-server/MCServer,mc-server/MCServer,thetaeo/cuberite,mmdk95/cuberite,linnemannr/MCServer,birkett/cuberite,Tri125/MCServer,johnsoch/cuberite,nevercast/cuberite,Altenius/cuberite,Schwertspize/cuberite,SamOatesPlugins/cuberite,Tri125/MCServer,jammet/MCServer,guijun/MCServer,Howaner/MCServer,guijun/MCServer,bendl/cuberite,kevinr/cuberite,birkett/cuberite,nevercast/cuberite,Schwertspize/cuberite,marvinkopf/cuberite,Fighter19/cuberite,tonibm19/cuberite,marvinkopf/cuberite,thetaeo/cuberite,mjssw/cuberite,linnemannr/MCServer,zackp30/cuberite,Schwertspize/cuberite,mjssw/cuberite,electromatter/cuberite,Frownigami1/cuberite,HelenaKitty/EbooMC,nevercast/cuberite,MuhammadWang/MCServer,HelenaKitty/EbooMC,MuhammadWang/MCServer,birkett/cuberite,tonibm19/cuberite,tonibm19/cuberite,HelenaKitty/EbooMC,zackp30/cuberite,Altenius/cuberite,tonibm19/cuberite,zackp30/cuberite,bendl/cuberite,Altenius/cuberite,nichwall/cuberite,kevinr/cuberite,thetaeo/cuberite,MuhammadWang/MCServer,nichwall/cuberite,ionux/MCServer,electromatter/cuberite,guijun/MCServer,kevinr/cuberite,Altenius/cuberite,Howaner/MCServer,ionux/MCServer,Haxi52/cuberite,johnsoch/cuberite,HelenaKitty/EbooMC,johnsoch/cuberite,nounoursheureux/MCServer,QUSpilPrgm/cuberite,Howaner/MCServer,linnemannr/MCServer,MuhammadWang/MCServer,marvinkopf/cuberite,electromatter/cuberite,Frownigami1/cuberite,Howaner/MCServer,nounoursheureux/MCServer,Haxi52/cuberite,guijun/MCServer,mmdk95/cuberite,SamOatesPlugins/cuberite,jammet/MCServer,Howaner/MCServer,mmdk95/cuberite,kevinr/cuberite