Add documentation for releasing

Author: pmeinhardt

maintainers.md

@@ -0,0 +1,17 @@
+# Publishing Package Versions
+
+## Overview
+
+The package is [published to the npm registry](https://www.npmjs.com/package/mdast-util-from-adf) via [GitHub Actions](./.github/workflows/publish.yml). Each time a new GitHub release is created, GitHub Actions will automatically push a new version to npm.
+
+To publish a new version to npm, all you need to do is:
+
+1. Bump the version number in the `package.json` [file](https://github.com/bitcrowd/mdast-util-from-adf/blob/main/package.json)
+2. [Create a new release](https://github.com/bitcrowd/mdast-util-from-adf/releases/new)
+3. Let the `publish` workflow [do its job](https://github.com/bitcrowd/mdast-util-from-adf/actions/workflows/publish.yml)
+
+For publishing, a valid [npm access token](https://www.npmjs.com/settings/bitcrowd/tokens) is required. We make one available to the workflow as a [secret](https://github.com/bitcrowd/mdast-util-from-adf/settings/secrets/actions).
+
+## References
+
+- https://docs.github.com/en/actions/publishing-packages/publishing-nodejs-packages