Add migration notice

adrianpk · adrianpk · commit f3f743d7495c · 2026-03-16T09:38:47.000+01:00
diff --git a/README.md b/README.md
@@ -1,5 +1,7 @@
 # HatMax
 
+> **Note:** Development has moved to [codeberg.org/hatmax/hatmax](https://codeberg.org/hatmax/hatmax). This repository is kept for historical reference.
+
 <p align="center">
   <img src="docs/img/hero.png" width="800">
 </p>
