chore: remove Python implementation, add README for Rust version

README.md

@@ -0,0 +1,46 @@
+# icon-color-tool
+
+A small GTK4 desktop app for editing the `ColorScheme-*` CSS colors
+embedded in [Breeze icon](https://github.com/KDE/breeze-icons) SVGs.
+
+## Usage
+
+```sh
+icon-color-tool                  # opens a searchable icon picker
+icon-color-tool path/to/icon.svg # opens directly in the color editor
+```
+
+The picker's search box does a fuzzy (subsequence) match against each
+icon's path. Selecting an icon (or passing one directly) opens the color
+editor: click a swatch to pick a new color for that `ColorScheme-*` class;
+changes save to disk immediately, and Undo/Redo are available from the
+toolbar.
+
+## Configuration
+
+On first run, a config file is created at
+`~/.config/icon-color-tool/config.toml`:
+
+```toml
+[settings]
+breeze_path = "~/.local/share/breeze-icons"
+```
+
+If the configured `breeze_path` doesn't exist (or is empty), the
+[breeze-icons](https://github.com/KDE/breeze-icons) repository is cloned
+there automatically (shallow clone via `git`, which must be installed and
+on `PATH`).
+
+Set the `BREEZE_ICONS_PATH` environment variable to override the
+configured path entirely (also auto-clones if missing).
+
+## Building
+
+Requires Rust (stable) and the GTK4 + librsvg development libraries
+installed system-wide (e.g. `gtk4-devel`/`libgtk-4-dev` and
+`librsvg2-devel`/`librsvg2-dev`, depending on your distro).
+
+```sh
+cargo build --release
+./target/release/icon-color-tool
+```