add releasing doc

RELEASING.md

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+# Releasing
+
+1. Go to "Release Package" in Actions.
+2. Click on the "Run workflow" dropdown menu.
+3. Choose the package to release and the version bump type.
+
+   Following [SemVer](https://semver.org/):
+   - **Patch** - Backward compatible bug fixes.
+   - **Minor** - New functionality in a backward compatible way.
+   - **Major** - Breaking API changes.
+
+4. A maintainer must approve the release before it proceeds.
+
+5. Once approved, the CI will automatically:
+   - Run tests.
+   - Bump the version.
+   - Create a git tag.
+   - Publish the package to npm.
+
+6. Once published, go to Releases and create a GitHub release using the generated tag.