docs(release): add RELEASE.md

RELEASE.md

@@ -0,0 +1,11 @@
+# Creating a Release
+
+[GitHub](https://github.com/orhun/git-cliff/releases), [crates.io](https://crates.io/crates/git-cliff/) and [Docker Hub](https://hub.docker.com/repository/docker/orhunp/git-cliff) releases are automated via [GitHub actions](./.github/workflows/cd.yml) and triggered by pushing a tag.
+
+1. Bump the version in [Cargo.toml](./Cargo.toml) according to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+2. Update [Cargo.lock](./Cargo.lock) by building the project via `cargo build`.
+3. Run the [release script](./release.sh): `./release.sh v[X.Y.Z]`
+4. Push the changes: `git push`
+5. Check if [Continuous Integration](https://github.com/orhun/git-cliff/actions) workflow is completed successfully.
+6. Push the tags: `git push --tags`
+7. Wait for [Continuous Deployment](https://github.com/orhun/git-cliff/actions) workflow to finish.