Add README badge

README.md

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 # ha-extron
 
+[![Ruff](https://github.com/NitorCreations/ha-extron/actions/workflows/ruff.yaml/badge.svg)](https://github.com/NitorCreations/ha-extron/actions/workflows/ruff.yaml)
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 [![Open your Home Assistant instance and open a repository inside the Home Assistant Community Store.](https://my.home-assistant.io/badges/hacs_repository.svg)](https://my.home-assistant.io/redirect/hacs_repository/?owner=NitorCreations&repository=https%3A%2F%2Fgithub.com%2FNitorCreations%2Fha-extron)
 
 Home Assistant integration for Extron switchers and audio processors.