Create AppData for remote-viewer to make it visible in gnome-software see https://people.freedesktop.org/~hughsient/appdata/ and for inspiration https://github.com/virt-manager/virt-manager/blob/master/data/virt-manager.appdata.xml
Fixed by https://git.fedorahosted.org/cgit/virt-viewer.git/commit/?id=f212c5a358db95bf618886398d22f04d0ec1ccf5
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