docs: add Cursor Cloud specific setup instructions to AGENTS.md (#62)

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Piotr Wodecki <PiotrWodecki@users.noreply.github.com>

Author: PiotrWodecki

AGENTS.md

@@ -0,0 +1,10 @@
+# fishjam-react-native-webrtc
+
+React Native WebRTC native module (npm; `package-lock.json`).
+
+## Cursor Cloud specific instructions
+
+Node (via nvm) is pre-installed; the startup script runs `npm install`. Non-obvious notes:
+
+- Validated command: `npm run lint` (runs `eslint --max-warnings 0` + `tsc --noEmit`, passes).
+- This is a native module: there are no headless-buildable JS bundles here, and iOS/Android builds require Xcode / the Android SDK (not available in the cloud VM). `npm run lint` is the meaningful local check.