Add contribution guidelines

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+Contributing
+============
+
+Inclusive language
+------------------
+
+This project has an inclusive language policy. Due to the long history of this
+codebase, this policy only applies to new contributions. For everything else,
+"we'll get to it when we get to it" applies.
+
+Inclusive language is important so as to not trivialize others' experiences.
+For example:
+
+- **DON'T** say "abusing the protocol"
+    **DO** say "misusing the protocol"