I've written up an appdata
file for tuxguitar so it can be part of gnome-software in a more
complete manner. Please find it attached.
It'll be great if this file can be included in future releases, and
optionally, if the build system could install it to /usr/share/appdata.
The installation isn't necessary, since us maintainers can do it
Please feel free to edit the file to improve the descriptions, add more screenshots etc. The screenshots must be 16:9 in aspect ratio though. Here's a post explaining how to make such screenshots:
More information on appdata files: