Add this extension to the Zikula Extension Library

#### Hi @zikula-modules!

You requested to add this extension to the [Zikula Extension Library](http://cmfcmf.ngrok.com/zk-dev/src/de/library/) :star:. You're just two clicks away from there:**0. Add a WebHook to this repository. This couldn't be done by the ExtensionLibrary, as you don't have sufficient permission. Please ask an admin of @zikula-modules to do so by following [these instructions](http://cmfcmf.ngrok.com/zk-dev/src/de/library/doc/webhook).**1. Merge this PR!
2. Add a new Tag as version 5.0.1 (either using the git command line, your favourite git client or the
[GitHub online interface](https://github.com/zikula-modules/Scribite/releases/new))!
3. You're done! After your extension is published, you can edit your vendor information (such as `logo`, `title`, `homepage` and `email` [at zikula.org](http://cmfcmf.ngrok.com/zk-dev/src/de/library/edit-vendor-information).

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)!