add a code of conduct

CODE_OF_CONDUCT.md

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+# pkgconf Code of Conduct
+
+We invite and encourage everybody to express their opinions on relevant
+topics.  All participants should at all times feel at ease to do so without
+fearing any form of attack, reprisal or harassment.  We ask everybody to be
+respectful and considerate towards each other, especially when attempting
+to provide constructive criticism.
+
+To foster tolerance, respect and hospitality in our community, we agree not
+to engage in discriminatory, disparaging or offensive speech or actions,
+including as to (but not limited to) gender, sexuality, race, nationality,
+religion or profession. We are a community of many different nationalities
+and backgrounds, and we cherish our strength in diversity. 
+
+
+## Reporting incidents
+
+Please report any incidents which may be perceived as violations to
+`nenolod+conduct@dereferenced.org`.  Incidents will be investigated and,
+if warranted, acted upon.
+
+
+## Credits
+
+This CoC is derived from the [FSFE Code of Conduct][fsfe-coc].
+
+   [fsfe-coc]: https://fsfe.org/about/codeofconduct.en.html