Add code of conduct

CONDUCT.md

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+## Contributer Code of Conduct
+
+This Code of Conduct is adapted[io.js CoC](https://github.com/nodejs/node/blob/v1.x/CONTRIBUTING.md#code-of-conduct), adapted from[Rust's CoC](http://www.rust-lang.org/conduct.html).
+
+* We are committed to providing a friendly, safe and welcoming
+  environment for all, regardless of gender, sexual orientation,
+  disability, ethnicity, religion, or similar personal characteristic.
+* Please avoid using overtly sexual nicknames 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 behaviour. We interpret the term
+  "harassment" as including the definition in the [Citizen Code of
+  Conduct](http://citizencodeofconduct.org/); 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 TC members immediately with a capture (log, photo, email) of
+  the harassment if possible.  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 behaviour is not welcome.
+* Avoid the use of personal pronouns in code comments or
+  documentation. There is no need to address persons when explaining
+  code (e.g. "When the developer")