add Contributing section to README.md

README.md

@@ -20,6 +20,26 @@ service, please see the following links:
   RP](docs/deploy-development-rp.md).
 
 
+## Contributing
+
+This project welcomes contributions and suggestions. Most contributions require
+you to agree to a Contributor License Agreement (CLA) declaring that you have
+the right to, and actually do, grant us the rights to use your contribution. For
+details, visit https://cla.microsoft.com.
+
+When you submit a pull request, a CLA-bot will automatically determine whether
+you need to provide a CLA and decorate the PR appropriately (e.g., label,
+comment). Simply follow the instructions provided by the bot. You will only need
+to do this once across all repositories using our CLA.
+
+This project has adopted the [Microsoft Open Source Code of
+Conduct](https://opensource.microsoft.com/codeofconduct/). For more information
+see the [Code of Conduct
+FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact
+[opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional
+questions or comments.
+
+
 ## Repository map
 
 * .github/workflows: CI workflows using GitHub Actions.