Align CoC with PSF

Author: hynek

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+While not being a [Python Software Foundation](https://www.python.org/psf-landing/) project, everyone interacting in this project is expected to follow the [PSF Code of Conduct](https://policies.python.org/python.org/code-of-conduct/).
+
+In general, this means that everyone is expected to be **open**, **considerate**, and **respectful** of others no matter what their position is within the project.
+
+
+## Enforcement
+
+We take Code of Conduct violations seriously, and will act to ensure our spaces are welcoming, inclusive, and professional environments to communicate in.
+
+If you need to raise a Code of Conduct report, you may do so privately by email to [Hynek Schlawack](mailto:[email protected]).
+
+Reports will be treated confidentially.
+
+Alternately you can make a [report to the Python Software Foundation](https://policies.python.org/python.org/code-of-conduct/Procedures-for-Reporting-Incidents/).