Add osu! to Garuda Gamer

osu! is a rhythm, free-to-play, open-source game which is really fun. It would be great if this was added to Garuda Gamer.

Github Link: GitHub - ppy/osu: rhythm is just a *click* away!

osu!lazer, the next major update to osu! has a native AppImage which can be found in the Releases section: Releases · ppy/osu · GitHub