Update root .gitignore to ignore Windows generated output files.  [skip ci] (#2354)
Update root .gitignore to ignore Windows generated output files.  [skip ci] (#2354)


cquinn/ponyc,cquinn/ponyc,ponylang/ponyc,Theodus/ponyc,jemc/ponyc,Theodus/ponyc,sgebbie/ponyc,cquinn/ponyc,dipinhora/ponyc,dipinhora/ponyc,CausalityLtd/ponyc,Theodus/ponyc,kulibali/ponyc,ponylang/ponyc,kulibali/ponyc,jemc/ponyc,Theodus/ponyc,Praetonus/ponyc,Theodus/ponyc,sgebbie/ponyc,kulibali/ponyc,ponylang/ponyc,cquinn/ponyc,kulibali/ponyc,dipinhora/ponyc,Praetonus/ponyc,Praetonus/ponyc,jemc/ponyc,sgebbie/ponyc,sgebbie/ponyc,CausalityLtd/ponyc,Praetonus/ponyc,CausalityLtd/ponyc,sgebbie/ponyc