Update README.md

Author: Joiversen

README.md

@@ -6,3 +6,5 @@
 Documentation is available at: https://os2iot.readthedocs.io/en/latest/ or [OS2IoT-docs](https://github.com/OS2iot/OS2IoT-docs)
 
 Start using docker-compose see: https://github.com/OS2iot/OS2IoT-docker 
+
+See [OS2iot-docs for contributing](https://github.com/OS2iot/OS2IoT-docs/blob/master/CONTRIBUTING.md)