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Added an appdata file, it is a cross-distribution standard which adds metadata for Linux software stores.
See also https://people.freedesktop.org/%7Ehughsient/appdata/ for reference.
E.g. for openSUSE packages with appdata files are listed here: https://software.opensuse.org/packages/Games
I also slightly modified the .desktop file, I changed the exec to be independent from installation path (e.g.
/usr/bin
,/usr/games
...).Also
Categories
should end with a trailing semicolon.