appstream / appdata files for games
I just read that Debian is also starting to use appstream / appdata
for apps like gnome-software:
I've been slowly working on adding appdata to all games packaged
in Fedora / rpmfusion. I must admit I've not gotten very far
yet, but others have also done appdata for a number of games in
Fedora. So all in all there is a decent chance that if you want
to appdata there already is a file in Fedora you can use.