Add Code of Conduct

CODE_OF_CONDUCT.md

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+# Contributor Code of Conduct
+
+As contributors and maintainers of this project, and in the interest of
+fostering an open and welcoming community, we pledge to respect all people who
+contribute through reporting issues, posting feature requests, updating
+documentation, submitting pull requests or patches, and other activities.
+
+We are committed to making participation in this project a harassment-free
+experience for everyone, regardless of level of experience, gender, gender
+identity and expression, sexual orientation, disability, personal appearance,
+body size, race, ethnicity, age, religion, or nationality.
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery
+* Personal attacks
+* Trolling or insulting/derogatory comments
+* Public or private harassment
+* Publishing other's private information, such as physical or electronic
+  addresses, without explicit permission
+* Other unethical or unprofessional conduct
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+By adopting this Code of Conduct, project maintainers commit themselves to
+fairly and consistently applying these principles to every aspect of managing
+this project. Project maintainers who do not follow or enforce the Code of
+Conduct may be permanently removed from the project team.
+
+The project maintainers share authority for dealing with code of conduct
+violations and share responsibility for creating an environment where
+these problems do not happen.  If anyone feels that a code of conduct
+violation has been ignored or has not been adequately addressed, then they
+should contact a project maintainer or some other community member in order
+to more adequately address the violation.  If a central authority is required to
+resolve such a situation, then that central authority consists of the project
+maintainers.
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community.
+
+This Code of Conduct was adapted from the [pandas Code of Conduct][pandas_coc]
+which was adapted from the [Contributor Covenant][homepage],
+version 1.3.0,
+available at [http://contributor-covenant.org/version/1/3/0/][version],
+and the [Swift Code of Conduct][swift].
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/3/0/
+[swift]: https://swift.org/community/#code-of-conduct
+[pandascoc]: https://github.com/pandas-dev/pandas-governance/blob/master/code-of-conduct.md