Added an appdata.xml file for Linux software gallery integration

[Mailaender]

See https://people.freedesktop.org/~hughsient/appdata/ for more information.

[Mailaender]

See https://build.opensuse.org/request/show/433055 for an integration test. I am not really sure what's wrong with the rpmlint checker as it crashes. The file seems to otherwise validate just fine.

[elbenfreund]

Thank you for your feedback, it is much appreciated.

Project hamster and its various sub-components is currently undergoing some major changes. We prepare the introduction of a rewritten codebase for most of the underlying functionality. A direct consequence of this is that it is unlikely that any open/new bugs within the current/old codebase will be fixed (unless someone steps up and offers to do so) as most resources currently available will be invested in making the rewrite prime time ready.

If you are still interested in working on the new codebase (repositories: hamster-lib/cli/gtk/dbus) we would be most thrilled. Please feel free to either open a new issue with the relevant repository and/or join the discussion on the mailinglist.
For more context please see our website.

Thanks for your interest and support! Eric.

[DimStar77]

Destination must not contain the file name - only the destination directory.

[Mailaender]

Fixed.

[Mailaender]

https://build.opensuse.org/request/show/433873 now all checks succeed.

[ederag]

Thanks for your contributions !
We definitely need this appdata.xml, but the interface changed a lot meanwhile.
Screenshots linked in this appdata.xml are for the "hamster-applet" (before 2.0) version.
So the best course of action might be to rebase this PR on the hamster_stable branch,
so that I can merge it there.

Then a separate PR would be best, based on the master branch,
with updated screenshots and data.
It should be possible to have the main screenshot.png in the root directory,
and other screenshots in a data/screenshots/ directory,
all tracked by git (png screenshots should be small enough for that).
Later on, it will be possible to get links for a specific release version,
and automate the process with bump2version for instance.

[ederag]

Well, changing the base branch myself turned out to be a mess. 😥
Revert. 😌

[ederag]

This work is being updated in PR #441. Closing, thanks for your contribution !

[ederag]

@Mailaender closed, but the proposition to rebase on the hamster-stable branch still holds,
if you want to get it merged there. Thanks again !