Adding a code of conduct for contributors taken from https://github.c…

…om/Bantik/contributor_covenant.

CODE_OF_CONDUCT.md

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+# Contributor Code of Conduct
+## Version 0.4
+
+As contributors and maintainers of this project, we pledge to respect
+all people who contribute through reporting issues, posting feature
+requests, updating documentation, submitting pull requests or patches,
+and other activities.
+
+If any participant in this project has issues or takes exception with
+a contribution, they are obligated to provide constructive feedback
+and never resort to personal attacks, trolling, public or private
+harassment, insults, or other 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. Project
+maintainers who do not follow the Code of Conduct may be removed from
+the project team.
+
+Instances of abusive, harassing, or otherwise unacceptable behavior
+may be reported by opening an issue or contacting one or more of the
+project maintainers.
+
+We promise to extend courtesy and respect to everyone involved in this
+project regardless of gender, gender identity, sexual orientation,
+ability or disability, ethnicity, religion, or level of experience.