README: buy me a coffee

README.md

@@ -4,6 +4,8 @@ The server behind live, shared models in [Archify Diagram Viewer](https://market
 
 One Rust process and PostgreSQL.
 
+Free and open source. If it saves you time, you can [buy me a coffee](https://buymeacoffee.com/root.at.skic) ☕
+
 ## How it works
 
 - **A space is one shared model.** Its content is a Yjs document with one `Y.Text` per model file, in the root map `files`, keyed by the path relative to the model root.
@@ -169,3 +171,9 @@ All settings come from the environment.
 ## Licence
 
 MIT
+
+## Support
+
+Archify Sync is built and maintained in my spare time. If it helps you, a coffee keeps the releases coming:
+
+[![Buy me a coffee](https://cdn.buymeacoffee.com/buttons/v2/default-yellow.png)](https://buymeacoffee.com/root.at.skic)