chore: add Compatibility section to readme

Author: d3cryptofc

README.md

@@ -9,4 +9,8 @@ And it was thinking a lot about this, spending a lot of time, that I decided to
 ## 🎉 Features
 
 - When player uses water bucket.
-- When water flows.
+- When water flows.
+
+## ⚡️ Compatibility
+
+Mud was officially introduced in Minecraft version 1.19, and it is my hope that this plugin will be compatible with 1.19+. Testing has only been done with 1.21.4, so please create an issue on github if it breaks in lower versions. Thank you!