Create CODE_OF_CONDUCT.md

CODE_OF_CONDUCT.md

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+# Contributor Code of Conduct
+
+The Creative Commons team is committed to fostering a welcoming community. This
+project, CC Vocabulary, 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][email_address] per our
+[reporting guidelines][reporting_guide].
+
+For a history of updates, see the [page history here][updates].
+
+[code_of_conduct]: https://creativecommons.github.io/community/code-of-conduct/
+[email_address]: mailto:conduct@creativecommons.org
+[reporting_guide]: https://creativecommons.github.io/community/code-of-conduct/enforcement/
+[updates]: https://github.com/creativecommons/creativecommons.github.io-source/commits/master/content/community/code-of-conduct/contents.lr