Add this extension to the Zikula Extension Library

#### Hi @cmfcmf-test!

You requested to add this extension to the [Zikula Extension Library](http://localhost/zk-dev/src/index.php/de/library/) :star:. You're just two clicks away from there:
1. Merge this PR!
2. Add a new Tag!

In case something doesn't work as expected, feel free to open an issue in the [Extension Library repository](https://github.com/craigh/ExtensionLibrary/issues/new)!