docs: add contributing guide and issue tracker link

CONTRIBUTING.md

@@ -0,0 +1,12 @@
+## Contributing
+
+Thanks for your interest in Vessel.
+
+- Issues and pull requests are handled on GitHub:
+  https://github.com/VikingOwl91/vessel
+
+- Keep changes focused and small.
+- UI and UX improvements are welcome.
+- Vessel intentionally avoids becoming a platform.
+
+If you’re unsure whether something fits, open an issue first.

README.md

@@ -370,6 +370,9 @@ All requests to `/ollama/*` are proxied to the Ollama API, enabling CORS.
 
 Contributions are welcome! Please feel free to submit a Pull Request.
 
+> Issues and feature requests are tracked on GitHub:
+> https://github.com/VikingOwl91/vessel/issues
+
 1. Fork the repository
 2. Create your feature branch (`git checkout -b feature/amazing-feature`)
 3. Commit your changes (`git commit -m 'Add some amazing feature'`)