docs: add minimalist code of conduct

CODE_OF_CONDUCT.md

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+Minimalist Code of Conduct
+====
+
+We believe that an elaborate code of conduct invites a lot of fighting over intricate details, much like law, and we do not have the resources to build up the equivalent of a legal system. Therefore we prefer keeping our rules as short as possible and filling the gaps with the mortar of human interaction: empathy.
+
+All we ask of members and contributors of this project is this:
+
+- Please treat each other with respect and understanding.
+- Please respect our wish to not serve as a stage for disputes about fairness or personal differences.
+
+If you can agree to these conditions, your contributions are welcome. If you can not, please don't spoil it for the rest of us.