Add CONTRIBUTING

CONTRIBUTING.md

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+# Contributing
+
+Thanks for considering contributing.
+
+If you haven't already, join the IRC ([irc.fatpeople.lol #fatchan](irc://irc.fatpeople.lol:+6697/fatchan)).
+
+Some links:
+  * [Kanban board](https://gitgud.io/fatchan/jschan/-/boards/4780) already has issues in swim lanes.
+  * IRC: [irc.fatpeople.lol #fatchan](irc://irc.fatpeople.lol:+6697/fatchan)
+
+## LICENSE?
+
+See [LICENSE](https://gitgud.io/fatchan/jschan/-/blob/master/LICENSE)
+
+## Making changes
+
+  * Bug? Open an issue.
+  * Request? Open an issue and ask. Saves wasting your time making changes that will be denied for being bad or unwanted.
+
+When contributing, make a merge request with a clear list of what you've done.
+
+Write clear commit messages. One line is fine for smaller changes, or multiple lines for bigger changes. Be clear and concise.
+
+    $ git commit -m "A brief summary of the commit
+    > 
+    > A paragraph describing what changed and its impact."
+
+## Coding conventions
+
+Read the code to understand, but basically:
+
+  * [standardjs](https://standardjs.com/) style for the most part, with some modifications.
+  * TAB for indentation.
+  * Please include comments.
+
+Thanks,
+Tom