Add gowall

[Achno]

New App Submission

• I've read the contribution guidelines.

Repo or homepage link:
https://github.com/Achno/gowall

Description:
A swiss army knife for cool image processing features.

Why I think it's awesome:

• Transforms the color scheme of your wallapper to your favorite theme (catppuccin, everforest...) to match your system's theme (Color correction), now you only need to like the design of the wallpaper and not worry about its colors.
• A lot of image processing features like (AI image upscaling,drawing borders, converting to pixel art,effects) so you can perfect your images.
• Terminal image preview in the following terminal emulators : Kitty, Ghostty, Konsole, Wezterm
• Really well documented : https://achno.github.io/gowall-docs/ providing visual examples for every image processing feature.