Add community health docs

CONTRIBUTING.md

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+# Contributing
+
+Thank you for your interest in contributing to this project. This file contains instructions that
+will help you work with the source code.
+
+Please note that if you have any questions or difficulties, you can reach the maintainer through
+GitHub Issues. Filing an issue is the preferred method for reporting bugs or issues with the
+development tool configuration for this project.
+
+If you'd like to suggest a small change, you can do that by directly creating a
+[Pull Request](https://docs.github.com/en/pull-requests). For larger changes, you are encouraged to
+file an issue first, so we can discuss the change before you spend too much time implementing it.
+
+Please note that the maintainer, Dave Rolsky (@autarch), mostly works on his FOSS projects in his
+free time, which means on weekends and days off. However, he does not work on these things _every_
+weekend, so it may be a little while before you get a response to your issue or PR.
+
+If it's been more than 3 weeks since you submitted an issue or PR, feel free to comment on the
+submission to nudge the maintainer, who is probably getting sucked into some new video game and
+spending all his time there.