docs: add Minecraft server join link

README.md

@@ -6,6 +6,8 @@
 [![Issues](https://img.shields.io/github/issues/andrewgazelka/hyperion)](https://github.com/andrewgazelka/hyperion/issues)
 [![Last Commit](https://img.shields.io/github/last-commit/andrewgazelka/hyperion)](https://github.com/andrewgazelka/hyperion/commits)
 
+Join the Minecraft server in 1.20.1 at: `hyperion-test.duckdns.org`.
+
 Thank you for your hard work[^1] [@CuzImClicks](https://github.com/CuzImClicks), [@Indra-db](https://github.com/Indra-db), [@james-j-obrien](https://github.com/james-j-obrien), [@Ruben2424](https://github.com/Ruben2424), [@SanderMertens](https://github.com/SanderMertens), [@Tebarem](https://github.com/Tebarem), and [@TestingPlant](https://github.com/TestingPlant).
 
 Hyperion is a **Minecraft game engine** that aims to enable a 10k player PvP battle to break the Guinness World