Create an AppData file

[appcenter]

AppCenter Dashboard could not find a com.github.nick92.coffee.appdata.xml file for your project.
Please create one and ensure it gets installed to /usr/share/metainfo/ to
provide additional data to application managers.

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For more information, see:

• The AppStream Quickstart Guide
• The AppStream Metadata Specification

If you need help with this issue please stop by the gitter channel.

Affects: 1.0.4 release