DOC: added ruff badge

README.md

@@ -2,6 +2,7 @@
 [![Coverage Status](https://coveralls.io/repos/github/HuttleyLab/DiverseSeq/badge.svg?branch=main)](https://coveralls.io/github/HuttleyLab/DiverseSeq?branch=main)
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/ef3010ea162f47a2a5a44e0f3f6ed1f0)](https://app.codacy.com/gh/HuttleyLab/DiverseSeq/dashboard?utm_source=gh&utm_medium=referral&utm_content=&utm_campaign=Badge_grade)
 [![CodeQL](https://github.com/HuttleyLab/DiverseSeq/actions/workflows/codeql.yml/badge.svg)](https://github.com/HuttleyLab/DiverseSeq/actions/workflows/codeql.yml)
+[![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)
 
 # DiverseSeq identifies the most diverse biological sequences from a collection