Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Athens
+
+These are mostly guidelines, not rules. Use your best judgment, and feel free to propose changes to this document in a pull request.
+
+Please first read the [Code of Conduct](https://github.com/tangjeff0/athens/blob/master/CODE_OF_CONDUCT.md).
+
+## Development Environment
+
+See the setup in the README.
+
+## Clojure
+
+Will probably setup [clj-kondo](https://github.com/borkdude/clj-kondo) with some config as a project linter.
+
+## Git Commit Messages
+
+Follow suggestions in https://www.conventionalcommits.org/en/v1.0.0/.
+
+## Issues and PRs
+
+Follow suggestions in https://github.com/codeforamerica/howto/blob/master/Good-GitHub-Issues.md
+
+Still don't have labels or really any issues yet. Working on it! :)