Added: Instruction on how to enable gamemode for all Proton games

[toluschr]

This is just what I use! I don't know if this is useful, but I still want to share it with you.

The simple python script is important for the steam overlay to work, since it gets loaded via LD_PRELOAD too.

[mdiluz]

Locally this only appears to work for a small period of time during launch, I'm not completely sure why. Tested with a couple of different games.

If it does work and can be refined, then it might need a note that it needs to be added for every individual version of Proton. Perhaps there's a way to enact that globally?

[kakra]

This would be fixed by #76 because you could just run the full Steam client with gamemoderun. However, I see that my branch needs rework because we also have integration with other launchers now (tho, those usually have out-of-the-box support for GameMode).

[kakra]

BTW: Should this be closed? The original repository to pull from even doesn't exist any longer.