docs: add Ruff badge to readme

Author: Elan456

README.md

@@ -13,7 +13,8 @@
 
 [![Rust core via PyO3](https://img.shields.io/badge/Rust-core%20via%20PyO3-orange)](https://pyo3.rs/)
 [![Built with maturin](https://img.shields.io/badge/Built%20with-maturin-1f6feb)](https://www.maturin.rs/)
-[![Code style: Black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
+[![Lint and format: Ruff](https://img.shields.io/badge/Lint%20and%20format-Ruff-46a758?logo=ruff&logoColor=white)](https://docs.astral.sh/ruff/)
+
 
 
 ![Interactive_V2_Screenshot](https://raw.githubusercontent.com/Elan456/fastquadtree/main/assets/interactive_v2_screenshot.png)