Add contributor pointers to readme

Author: bcantoni

README.md

@@ -16,7 +16,7 @@ To see sample code that works directly with the REST API (in Java, Python, or Po
 For more information on installing and using TSC, see the documentation:
 <https://tableau.github.io/server-client-python/docs/>
 
-
+To contribute, see our [Developer Guide](https://tableau.github.io/server-client-python/docs/dev-guide). A list of all our contributors to date is in [CONTRIBUTORS.md].
 
 ## License
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