docs: add Contributing section to README

Patel230 · Patel230 · commit afc8dae2e744 · 2026-06-07T18:42:55.000+05:30
diff --git a/README.md b/README.md
@@ -59,6 +59,10 @@ ignore:
   - testdata/
 ```
 
+## Contributing
+
+Contributions are welcome — please read [CONTRIBUTING.md](CONTRIBUTING.md) before opening a pull request.
+
 ## License
 
 MIT - see [LICENSE](LICENSE) for details.
