Create CONTRIBUTING.md

Author: koddsson

CONTRIBUTING.md

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+## Publishing this package
+
+Publishing this package to npm is done via a [GitHub action](https://github.com/github/eslint-plugin-github/blob/main/.github/workflows/publish.yml) which triggers when a new GitHub Release is created.
+
+To publish to npm, create a release, give it an appropriate [Semantic Versioning](https://semver.org/) tag and fill out the release description. Once you publish the release, the GitHub action will be triggered and it will publish to npm.