Update readme

README.md

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 # terraform-digitalekanaler-apprunner-internal
-Terraform module for internal applications hosted on vylabs.io
+Terraform module for internal applications hosted on vylabs.io  
+See `/example` for usage  
 
-See example for usage
+## Release
+
+This library is configured to release automatically with GitHub Actions. PR title, and the final commit message after squash and merge, _must_ include one of the following tags:
+
+- [skip ci] -> the commit will not be picked up by GitHub Actions and no release will be made
+- [patch] -> the commit does not add functionality, and does not break existing functionality
+- [minor] -> the commit adds new functionality without breaking existing functionality
+- [major] -> the commit breaks existing functionality
+
+The tag will decide which version this library will be released at. Read more about semantic
+versioning [here](https://semver.org/).