Create `CONTRIBUTING.md`

`CONTRIBUTING.md` is a standard file to have in any open-source
repository. This file instructs new contributors on how to contribute to
the project, as well as the Code of Conduct.

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+# Contributing to MMOSMacs
+
+Howdy, and welcome to the MMOSMacs git repository. This document
+outlines the conventions and standards for the project.
+
+
+## This is personal
+
+Please understand that this is my personal Emacs configuration. MMOSMacs
+is designed to meet my personal needs. I welcome any and all
+contributions, and I will do my best to make MMOSMacs accessible to
+others, but my needs and preferences ultimately take priority.
+
+All contributors are listed at the end of this document. If you have
+contributed and your name does not appear here, submit a PR or RFC Issue
+for it to be added.
+
+
+## Code of Conduct
+
+I will reject all contributions from:
+- people who abuse other contributors.
+- people I know to be affiliated with any state agency.
+
+Furthermore, individual items will be rejected because of:
+- exceptionally vulgar language.
+- ignorance or disregard of the `STYLE_GUIDE.md` or Issue/PR templates.
+
+
+## How to Contribute
+
+There are several ways you can contribute.
+
+The easiest way you can contribute is by taking part in the discussions
+on the [GitHub Issues page](https://github.com/MountainMan1312/MMOSMacs/Issues).
+You can comment on topics that already have an existing Issue, or you
+can submit your own if it does not already exist. Issues can take the
+form of:
+- **Feedback**: share your thoughts about MMOSMacs.
+- **Bug Report**: discusion about a problem with the MMOSMacs code.
+- **RFC**: discussion about making a change to MMOSMacs.
+
+Before submitting a new issue, search for existing duplicate issues. If
+it already exists, comment on the existing Issue instead of making a new
+one. Duplicate issues will be removed and you will be asked to move your
+post to the comment section of the existing post. It's not to be rude,
+it's just for organization's sake.
+
+Each type of Issue has an Issue Template. The templates can be found in
+the `.github/ISSUE_TEMPLATE/` directory. Pull reqeusts also have
+templates which are located in `.github/PULL_REQUEST_TEMPLATE/`.
+
+To contribute code:
+1. Make an RFC or find an existing one
+2. Discuss your proposed changes
+3. Make your changes
+4. Submit a Pull Request