added Code of Conduct and Contributing sections

Author: TimidRobot

README.md

@@ -18,6 +18,24 @@ This repostory is currently for:
 [issues]: https://github.com/creativecommons/creativecommons.org/issues
 
 
+## Code of Conduct
+
+[`CODE_OF_CONDUCT.md`](CODE_OF_CONDUCT.md):
+> The Creative Commons team is committed to fostering a welcoming community.
+> This project and all other Creative Commons open source projects are governed
+> by our [Code of Conduct][code_of_conduct]. Please report unacceptable
+> behavior to [conduct@creativecommons.org](mailto:conduct@creativecommons.org)
+> per our [reporting guidelines][reporting_guide].
+
+[code_of_conduct]:https://opensource.creativecommons.org/community/code-of-conduct/
+[reporting_guide]:https://opensource.creativecommons.org/community/code-of-conduct/enforcement/
+
+
+## Contributing
+
+See [`CONTRIBUTING.md`](CONTRIBUTING.md).
+
+
 ## Issues
 
 This repository's [Issues][issues] is also the primary location for public help