Roots is a game server daemon that manages Docker containers for game servers

I wouldn't limit yourself to describing it as a game server daemon. It's effectively a IAAS / PAAS platform if you switch to a plugin model for those games. Well done.

Can you add a License to the repo please?

Looking over the code it does not appear to actually do anything.

If you want something like this check out https://pterodactyl.io/

It has pre-built support for like 100 games: https://github.com/pterodactyl/game-eggs

Be warned, no license listed.