add link to contributing.md in wg file

Author: jlcohoon

WORKING-GROUP.md

@@ -7,7 +7,7 @@ Design System maintainers are responsible for developing and sustaining the [STR
 - Ensure other contributors have adequate opportunity to engage  
 - Define and maintaining a product roadmap
 
-Read about STRUDEL's full governance system [here](https://github.com/strudel-science/.github/blob/main/README.md).
+Read about STRUDEL's full governance system [here](https://github.com/strudel-science/.github/blob/main/README.md). Read about how you can contribute without joinining the working group in [CONTRIBUTING.md](CONTRIBUTING.md).
 
 ## Roadmap
 *Current priorities:*