docs: add initial README

README.md

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+# ccolors
+
+Small CLI tool to extract dominant color palettes from images.
+
+## Features
+
+- JPEG / PNG support
+- Terminal color preview
+- HEX output
+- JSON export
+- No external dependencies
+
+## Build
+
+### Linux / macOS
+```bash
+mkdir build
+cd build
+cmake ..
+make```
+
+## Usage
+```bash
+./ccolors image.jpg
+```
+
+## Output
+- Prints color swatches + hex
+- Writes palette.json
+
+## Dependencies
+- stb_image.h (included)
+
+## License
+MIT