Added UltraStar Deluxe

UltraStar Deluxe is a free OpenSource karaoke game for your PC. The
gameplay experience is similar to that of commercial product SingStar™
by Sony Computer Entertainment, which is exclusively available for the
Playstation®. Unlike SingStar™, however, UltraStar Deluxe allows users
to create their own songs.
Merge pull request #3115 from alebcay/ultrastar-deluxe

Added UltraStar Deluxe