Update .gitignore.
Update .gitignore.

wpilibsuite/ntcore,wpilibsuite/ntcore,333fred/ntcore,wpilibsuite/ntcore,333fred/ntcore,wpilibsuite/ntcore,robotdotnet/ntcore,robotdotnet/ntcore,robotdotnet/ntcore,333fred/ntcore,333fred/ntcore,robotdotnet/ntcore