[COMNMUNITY] add code of conduct and conflict resolution guide

CODE_OF_CONDUCT.md

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+
+# Code of Conduct
+
+* [Code of Conduct for The Apache Software Foundation][1]
+
+## Conflict Resolution
+
+Conflicts in an open source project can take many forms, from someone having a bad day and using harsh and hurtful language in the issue queue, to more serious instances such as sexist/racist statements or threats of violence, and everything in between.
+
+If the behavior is threatening or harassing, or for other reasons requires immediate escalation, please see below.
+
+However, for the vast majority of issues, we aim to empower individuals to first resolve conflicts themselves, asking for help when needed, and only after that fails to escalate further. This approach gives people more control over the outcome of their dispute. 
+
+If you are experiencing or witnessing conflict, we ask you to use the following escalation strategy to address the conflict:
+
+1.  Address the perceived conflict directly with those involved, preferably in a real-time medium.
+2.  If this fails, get a third party (e.g. a mutual friend, and/or someone with background on the issue, but not involved in the conflict) to intercede.
+3.  If you are still unable to resolve the conflict, and you believe it rises to harassment or another code of conduct violation, report it.
+
+## Reporting Violations
+
+Violations of the Code of Conduct can be reported to [Apache MXNet Project PMC (PPMC)](mailto:[email protected]). The PPMC will determine whether the Code of Conduct was violated, and will issue an appropriate sanction, possibly including a written warning or expulsion from the project, project sponsored spaces, or project forums. We ask that you make a good-faith effort to resolve your conflict via the conflict resolution policy before submitting a report.
+
+
+[1]: https://www.apache.org/foundation/policies/conduct.html