chore(doc): add documentation of release process

relates to STACKITTPR-200

Author: rubenhoenle

README.md

@@ -189,6 +189,10 @@ If you encounter any issues or have suggestions for improvements, please open an
 
 Your contribution is welcome! For more details on how to contribute, refer to our [contribution guide](./CONTRIBUTION.md).
 
+## Release creation
+
+See the [release documentation](./RELEASE.md) for further information.
+
 ## License
 
 Apache 2.0

RELEASE.md

@@ -0,0 +1,13 @@
+# Release
+
+## Release creation
+
+> [!IMPORTANT]
+> Consider informing / syncing with the team before creating a new release.
+
+1. Check out latest main branch on your machine
+2. Create git tag: `git tag vX.X.X`
+3. Push the git tag: `git push origin --tags`
+4. The [release pipeline](https://github.com/stackitcloud/stackit-cli/actions/workflows/release.yaml) will build the release and publish it on GitHub
+5. Ensure the release was created properly using the [releases page](https://github.com/stackitcloud/stackit-cli/releases)
+