Implement a code of conduct

This helps to set basic expectations, making sure that everyone is on
the same page. It's an important step in establishing a welcome and
inclusive project culture.

This Code of Conduct is adapted from version 1.4 of the Contributor
Covenant at <https://www.contributor-covenant.org>. It's licensed
under CC BY 4.0.

Signed-off-by: Jason Self <j@jxself.org>

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+Contributor Covenant Code of Conduct
+====================================
+
+Our Pledge
+----------
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our
+project and our community a harassment-free experience for everyone,
+regardless of age, body size, disability, ethnicity, gender identity
+and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity
+and orientation.
+
+Our Standards
+-------------
+
+Examples of behavior that contributes to creating a positive
+environment include:
+
+-   Using welcoming and inclusive language
+-   Being respectful of differing viewpoints and experiences
+-   Gracefully accepting constructive criticism
+-   Focusing on what is best for the community
+-   Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+-   The use of sexualized language or imagery and unwelcome sexual
+    attention or advances
+-   Trolling, insulting/derogatory comments, and personal or political
+    attacks
+-   Public or private harassment
+-   Publishing others' private information, such as a physical or
+    electronic address, without explicit permission
+-   Other conduct which could reasonably be considered inappropriate
+    in a professional setting
+
+Our Responsibilities
+--------------------
+
+Project maintainers are responsible for clarifying the standards of
+acceptable behavior and are expected to take appropriate and fair
+corrective action in response to any instances of unacceptable
+behavior.
+
+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.
+
+Scope
+-----
+
+This Code of Conduct applies both within project spaces and in public
+spaces when an individual is representing the project or its
+community. Examples of representing a project or community include
+using an official project e-mail address, posting via an official
+social media account, or acting as an appointed representative at an
+online or offline event. Representation of a project may be further
+defined and clarified by project maintainers.
+
+Enforcement
+-----------
+
+Instances of abusive, harassing, or otherwise unacceptable behavior
+may be reported by contacting jxself on IRC via private message or by
+emailing <j@jxself.org>. All complaints will be reviewed and
+investigated and will result in a response that is deemed necessary
+and appropriate to the circumstances. The project team is obligated to
+maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted
+separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct
+in good faith may face temporary or permanent repercussions as
+determined by other members of the project's leadership.
+
+Attribution
+-----------
+
+This Code of Conduct is adapted from version 1.4 of the Contributor 
+Covenant at <https://www.contributor-covenant.org>. It's licensed 
+under the Creative Commons Attribution 4.0 License 
+<https://creativecommons.org/licenses/by/4.0/>