Revert "Delete CODE_OF_CONDUCT.md (use organization .github version)"

This reverts commit e62b5a1.

Author: TimidRobot

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 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].
+
+For a history of updates, see the [page history here][updates].
+
+[code_of_conduct]: https://opensource.creativecommons.org/community/code-of-conduct/
+[reporting_guide]: https://opensource.creativecommons.org/community/code-of-conduct/enforcement/
+[updates]: https://github.com/creativecommons/creativecommons.github.io-source/commits/main/content/community/code-of-conduct/contents.lr