Add backgrounds folder for theme wallpapers

backgrounds/README.md

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+# Wallpapers
+
+Put wallpapers for the **tintenblau** Omarchy theme in this folder.
+
+- Supported: `.jpg` `.jpeg` `.png` `.gif` `.bmp` `.webp` and video `.mp4` `.m4v` `.mov` `.webm` `.mkv` `.avi`
+- When the theme is installed from this repo, Omarchy stages this folder as the theme's `backgrounds/` directory.
+- Cycle backgrounds with `Super + Ctrl + Space`; they also show up in the Omarchy background picker.
+- Wallpapers placed in `~/.config/omarchy/backgrounds/tintenblau/` are picked up as well.
+
+After adding wallpapers, reinstall the theme (`omarchy theme install <repo-url>`) or update the installed clone and re-apply it with `omarchy theme set tintenblau` so Omarchy picks them up.