chore: include contributors and community links into readme

Author: goodroot

README.md

@@ -180,3 +180,11 @@ run()
     .then(console.log)
     .catch(console.error)
 ```
+
+## Community
+
+If you need help, have additional questions or want to provide feedback, you
+may find us on our [Community Forum](https://community.questdb.io/).
+
+You can also [sign up to our mailing list](https://questdb.io/contributors/)
+to get notified of new releases.