docs(coc): move document from discord to github

CODE_OF_CONDUCT.md

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+# The Komorebi Code of Conduct
+
+This document is based on the [Rust Code of
+Conduct](https://www.rust-lang.org/policies/code-of-conduct)
+
+## Conduct
+
+- We are committed to providing a friendly, safe and welcoming environment for
+all, regardless of level of experience, gender identity and expression, sexual
+orientation, disability, personal appearance, body size, race, ethnicity, age,
+religion, nationality, or other similar characteristic.
+
+- Please avoid using overtly sexual aliases or other nicknames that might
+detract from a friendly, safe and welcoming environment for all.
+
+- Please be kind and courteous. There’s no need to be mean or rude.
+
+- Respect that people have differences of opinion and that every design or
+implementation choice carries a trade-off and numerous costs. There is seldom a
+right answer.
+
+- Please keep unstructured critique to a minimum. If you have solid ideas you
+want to experiment with, make a fork and see how it works.
+
+- We will exclude you from interaction if you insult, demean or harass anyone.
+That is not welcome behavior. We interpret the term “harassment” as including
+the definition in the [Citizen Code of
+Conduct](https://github.com/stumpsyn/policies/blob/master/citizen_code_of_conduct.md);
+if you have any lack of clarity about what might be included in that concept,
+please read their definition. In particular, we don’t tolerate behavior that
+excludes people in socially marginalized groups.
+
+- Private harassment is also unacceptable. No matter who you are, if you feel
+you have been or are being harassed or made uncomfortable by a community member,
+please contact me immediately. Whether you’re a regular contributor or a
+newcomer, we care about making this community a safe place for you and we’ve got
+your back.
+
+- Likewise any spamming, trolling, flaming, baiting or other attention-stealing
+behavior is not welcome.