Add AppImage update information

[shuvashish76]

Short Summary

When trying to update via AppImageUpdate

Steps to Reproduce the Issue

Simply try to update via the mentioned tool.

Kando Version

2.2.0

Installation Method

Via an installer downloaded from a release on GitHub

Desktop Environment

KDE on Wayland

Environment Version

EndeavourOS x86_64 KDE Plasma 6.6.0 KWin (Wayland)

Additional Information

• https://github.com/AppImageCommunity/AppImageUpdate#update-information-overview
• https://github.com/AppImage/AppImageSpec/blob/master/draft.md#update-information
• https://github.com/ivan-hc/AppImage-tips

[Schneegans]

Thanks for the suggestion! I changed the type from bug report to feature request as this is simply not supported currently. If anybody wants to look into this, I would be very happy 😄