Update readme.txt

Author: Syeda-Mal

readme.txt

@@ -6,3 +6,23 @@ Tested up to: 5.0.3
 Requires PHP: 7.0
 License: GPLv2 or later
 License URI: https://www.gnu.org/licenses/gpl-2.0.html
+
+## Code of conduct
+
+[`CODE_OF_CONDUCT.md`][org-coc]:
+> 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].
+
+[org-coc]: https://github.com/creativecommons/.github/blob/main/CODE_OF_CONDUCT.md
+[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`][org-contrib].
+
+[org-contrib]: https://github.com/creativecommons/.github/blob/main/CONTRIBUTING.md