asc: Add missing file


(nia)

[Desktop Entry]
Name=Advanced Strategic Command
GenericName=Strategy Game
Comment=Defend your Command
Comment[de]=Verteidige deinen Kommandobereich
Type=Application
Exec=asc
Icon=asc
Terminal=false
Categories=Game;StrategyGame;
Keywords=strategy;battle;isle;turn-based;hexagon;tiles;multiplayer;singleplayer;AI;maps;editor;