Add contributing information

AUTHORS.md

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+# Authors
+
+<!--
+	including your email or website is optional,
+	but it does allow people to contact you
+-->
+
+- [DJ Chase](https://dj-chase.com/)

CONTRIBUTING.md

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+# Contributing
+
+I normally use [Sourcehut][1] for my projects, which is based on the
+[`git send-email`][2] workflow. I intend to make Sourcehut the primary repo once
+it’s done recoving from the DDoS attack (I’ll keep this mirror up though), so
+most work on this project currently uses Sourcehut infrastructure. The Tildegit
+repo is basically just so people can clone it.
+
+[1]: https://sourcehut.org/
+[2]: https://git-send-email.io/
+
+## Normal contributing stuff
+
+All contributions are welomed. If you can, please try to follow the format
+below. If you can’t, just send an email to ~u9000/vtt-embed@lists.sr.ht asking
+me to pull from your remote (remember to include the URL of your remote), or
+just send an email.
+
+1. `git pull`
+2. contribute
+3. add your name to AUTHORS
+4. commit
+5. `git send-email --to='~u9000/vtt-embed@lists.sr.ht' HEAD^` (or `HEAD~n` for
+   the last *n* commits)
+
+## Issues
+
+To make the future transition easier,
+[issues are already hosted on Sourcehut][3]. Before raising an issue, please
+[email the mailing list][4] first to discuss.
+
+[3]: https://todo.sr.ht/~u9000/vtt-embed
+[4]: https://lists.sr.ht/~u9000/vtt-embed