add description for games category/game administrative utilities & control panels categories

- https://github.com/awesome-selfhosted/awesome-selfhosted/issues/2984

README.md

@@ -1016,6 +1016,8 @@ _Related: [Groupware](#groupware)_
 
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+Multiplayer game servers and [browser games](https://en.wikipedia.org/wiki/Browser_game).
+
 - [A Dark Room](https://github.com/doublespeakgames/adarkroom) - Minimalist text adventure game for your browser. ([Demo](https://adarkroom.doublespeakgames.com/)) `MPL-2.0` `HTML5`
 - [elevatorsaga](https://play.elevatorsaga.com/) - The elevator programming game. ([Source Code](https://github.com/magwo/elevatorsaga)) `MIT` `Javascript`
 - [EmuLinkerSF](https://emulinker.org) - EmuLinkerSF is an open source Kaillera server. Kaillera is a client/server system that any emulator can implement to enable netplay over the Internet. ([Source Code](https://github.com/God-Weapon/EmuLinkerSF)) `GPL-2.0` `Java`
@@ -1043,6 +1045,8 @@ _Related: [Groupware](#groupware)_
 
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+Utilities for managing game servers.
+
 - [ARRCON](https://github.com/radj307/ARRCON) - Terminal-based RCON client compatible with any game servers using the Source RCON Protocol. `GPL-3.0` `C++`
 - [Lancache](https://lancache.net) `⚠` - LAN Party game caching made easy. ([Source Code](https://github.com/lancachenet/monolithic)) `MIT` `Docker/Shell`
 - [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`