docs: add docs about auto-releases

docs/releases/readme.md

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+# Auto-Release
+
+RockMigrations comes with a GitHub Workflow file that you can use to automatically create releases of your modules or projects.
+
+All you have to do is to add this file to your `.github/workflows` directory:
+
+```yaml
+name: Auto-Release
+
+# create a release when a commit is pushed to the main branch
+on:
+  push:
+    branches:
+      - main
+
+# run the auto-release workflow from rockmigrations
+jobs:
+  auto-release:
+    uses: baumrock/RockMigrations/.github/workflows/auto-release.yml@main
+    # optionally set the email of the committer
+    # with:
+    #   email: "[email protected]"
+    secrets:
+      token: ${{ secrets.GITHUB_TOKEN }}
+```
+
+This will use the https://www.conventionalcommits.org/en/v1.0.0/ specification for your commits.
+
+Basically you just have to prefix your commit messages with one of the following keywords:
+
+- `feat: ...` for features
+- `fix: ...` for bug fixes
+- `chore: ...` for other changes
+
+All `fix` commits will bump the version number from `x.y.z` to `x.y.z+1`. All `feat` commits will bump the version from `x.y.z` to `x.y+1.0`.
+
+Major version bumps are created when a breaking change was introduced, which you can specify by adding a `!` to the end of the commit key: `feat!: whatever`.