docs/: Add help for contributors and a code of conduct for project

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

docs/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. 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.
+
+This code of conduct applies both within project spaces and in public
+spaces when an individual is representing the project or its community.
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may
+be reported by opening an issue or contacting one or more of the project
+maintainers.
+
+This Code of Conduct is adapted from the [Contributor Covenant][1],
+[version 1.2.0][2].
+
+[1]: http://contributor-covenant.org
+[2]: http://contributor-covenant.org/version/1/2/0/