Add LinuxGSM

CLI tool to manage and deploy game servers. See issue #1555

README.md

@@ -952,6 +952,7 @@ Games, game servers and control panels.
 - [Hextris](https://github.com/Hextris/hextris) - Fast paced HTML5 puzzle game inspired by Tetris. ([Demo](https://hextris.github.io/hextris)) `GPL-3.0` `HTML5`
 - [Legend of the Green Dragon](https://github.com/lotgd/core) - Legend of the Green Dragon is a text-based RPG originally developed by Eric Stevens and JT Traub as a remake of and homage to the classic BBS Door game, Legend of the Red Dragon, by Seth Able Robinson. ([Demo](http://lotgd.net/)) `AGPL-3.0` `PHP`
 - [Lila](https://lichess.org/) - The forever free, adless and open source chess server powering lichess.org, with official iOS and Android client apps. ([Source Code](https://github.com/ornicar/lila)) `AGPL-3.0` `Scala`
+- [LinuxGSM](https://linuxgsm.com/) - CLI tool for deployment and management of dedicated game servers on Linux: more than 120 games are supported. ([Source Code](https://github.com/GameServerManagers/LinuxGSM)) `MIT` `Shell`
 - [Mindustry](https://mindustrygame.github.io/) - Factorio-like tower defense game. Build production chains to gather more resources, and build complex facilities. ([Source Code](https://github.com/Anuken/Mindustry)) `GPL-3.0` `Java`
 - [Minetest](https://www.minetest.net/) - An open source voxel game engine. Play one of our many games, mod a game to your liking, make your own game, or play on a multiplayer server. ([Source Code](https://github.com/minetest/minetest)) `LGPL-2.1/CC-BY-SA-3.0/Other` `C++`
 - [MTA:SA](https://mtasa.com/) `⚠` - Multi Theft Auto (MTA) is a software project that adds network play functionality to Rockstar North's Grand Theft Auto game series, in which this functionality is not originally found. ([Source Code](https://github.com/multitheftauto/mtasa-blue)) `GPL-3.0` `C++`