docs: add code of conduct (#204)

* docs: add code of conduct

* docs: modify the code of conduct

CODE_OF_CONDUCT.md

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+# The Mercury Code of Conduct
+
+## Conduct
+
+**Contact Mercury moderators:** [mercury@postlight.com](mailto:mercury@postlight.com)
+
+*   We are committed to providing a friendly, safe and welcoming environment for
+all, regardless of level of experience, gender, gender identity and expression,
+sexual orientation, disability, personal appearance, body size, race, ethnicity,
+age, religion, nationality, or other similar characteristic.
+
+*   Please avoid avoid using racist, sexually explicit or otherwise hostile
+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](http://bit.ly/2jCvEok); 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 one of the channel ops or any of the [Mercury moderation team](mailto:mercury@postlight.com)
+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.
+
+## Moderation
+
+These are the policies for upholding our community's standards of conduct. If you
+feel that a thread needs moderation, please contact the [Mercury moderation team](mailto:mercury@postlight.com).
+
+1.  Remarks that violate the Mercury standards of conduct, including hateful, hurtful,
+oppressive, or exclusionary remarks, are not allowed. (Cursing is allowed, but
+never targeting another user, and never in a hateful manner.)
+
+2.  Remarks that moderators find inappropriate, whether listed in the code of
+conduct or not, are also not allowed.
+
+3.  Moderators will first respond to such remarks with a warning.
+
+4.  If the warning is unheeded, the user will be "kicked," i.e., kicked out of
+the communication channel to cool off.
+
+5.  If the user comes back and continues to make trouble, they will be banned,
+i.e., indefinitely excluded.
+
+6.  Moderators may choose at their discretion to un-ban the user if it was a first
+offense and they offer the offended party a genuine apology.
+
+7.  If a moderator bans someone and you think it was unjustified, please take it
+up with that moderator, or with a different moderator, **in private**. Complaints
+about bans in-channel are not allowed.
+
+8.  Moderators are held to a higher standard than other community members. If a
+moderator creates an inappropriate situation, they should expect less leeway than
+others.
+
+In the Mercury community we strive to go the extra step to look out for each other.
+Don't just aim to be technically unimpeachable, try to be your best self. In
+particular, avoid flirting with offensive or sensitive issues, particularly if
+they're off-topic; this all too often leads to unnecessary fights, hurt feelings,
+and damaged trust; worse, it can drive people away from the community entirely.
+
+If someone takes issue with something you said or did, resist the urge to be
+defensive. Just stop doing what it was they complained about and apologize. Even
+if you feel you were misinterpreted or unfairly accused, chances are good there
+was something you could've communicated better — remember that it's your responsibility
+to make your fellow community members comfortable. Everyone wants to get along and we
+are all here first and foremost because we want to talk about cool technology.
+You will find that people will be eager to assume good intent and forgive as long
+as you earn their trust.
+
+The enforcement policies listed above apply to all official Mercury venues; including GitHub
+repositories under postlight/mercury such as mercury-rs and other Postlight repositories
+with a \*-mercury or mercury-\* naming convention; For other projects adopting the Mercury
+Code of Conduct, please contact the maintainers of those projects for enforcement.
+If you wish to use this code of conduct for your own project, consider explicitly
+mentioning your moderation policy or making a copy with your own moderation policy
+so as to avoid confusion.
+
+*Adapted from the [Rust Code of Conduct](https://bit.ly/2jhrmEo).*