Create CONTRIBUTING.md

CONTRIBUTING.md

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+footnotes welcomes contributions!
+
+Please follow these guidelines when contributing, as it will give your pull request the best chance of being accepted:
+
+# Branching
+
+- footnotes uses [GitHub Flow](https://githubflow.github.io/)
+- branch off of `main` to start developing
+- give your new branch a descriptive name
+- when ready, submit a pull request to merge your branch with `main`
+
+# Commits
+
+- footnotes uses [Conventional Commits](https://www.conventionalcommits.org)
+- keep individual commits as small as possible
+
+# Versioning
+
+- footnotes uses [Semantic Versioning](https://semver.org/)