Credit the fork origin and the adapter inspiration

The plugin no longer resembles jrimmer's original much, but attribution
belongs in the README before someone digs through history for it; the
Codemancer branch link is pinned because that adapter only exists there.

README.md

@@ -440,6 +440,11 @@ grep -i "chatto\|websocket\|realtime" ~/.hermes/logs/gateway.log | tail -30
 - **Minimal dependencies**: Only requires `chattolib[realtime]>=0.4.20.post1`, which is vendored — nothing to install.
 - **No message backfill**: Events missed while the gateway is down are gone — Chatto keeps no replay for the bot. Redelivered events after a reconnect are recognised and processed only once; anything genuinely new starts from the moment of reconnection.
 
+## Acknowledgements
+
+- This project started as a fork of [jrimmer/hermes-chatto-plugin](https://github.com/jrimmer/hermes-chatto-plugin/) — little of the original code remains, but it got us started.
+- Our adapter implementation was inspired by [TheCodemancerLtd's Chatto platform adapter](https://github.com/TheCodemancerLtd/hermes-agent/blob/feat/chatto-integration/plugins/platforms/chatto/adapter.py).
+
 ## License
 
 MIT