Missing description

[jnweiger]

The appinfo/info.xml of this app says

<name>Data Exporter</name>
<summary>Set of tools to export/import user-data</summary>
<description>[PLACEHOLDER]</description>

Should we update the description from the README.md?

A cli tool which allows exporting and importing user-data like settings, files and shares to migrate data from one instance in to another.
**WARNING:** This app is in early development, don't use it in production.