Add PufferPanel (#3444)

Co-authored-by: nodiscc <nodiscc@gmail.com>

README.md

@@ -1021,6 +1021,7 @@ 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`
+- [PufferPanel](https://www.pufferpanel.com/) - PufferPanel is an open source game server management panel, designed for both small networks and game server providers. ([Source Code](https://github.com/pufferpanel/pufferpanel)) `Apache-2.0` `Go`
 - [Pterodactyl](https://pterodactyl.io/) - Management panel for game servers, with an intuitive UI for end users. ([Source Code](https://github.com/pterodactyl/panel)) `MIT` `PHP`
 - [RconCli](https://github.com/gorcon/rcon-cli) - CLI for executing queries on a remote Valve Source dedicated server using the RCON Protocol. `MIT` `Go`