Update README.md with Discord badge (#44)

README.md

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 Welcome to the Ultralytics `.github` repository! This repository is your go-to location for shared resources, community guidelines, and templates that ease collaboration both within the Ultralytics team and with the open source community at large.
 
-[![Ultralytics Actions](https://github.com/ultralytics/.github/actions/workflows/format.yml/badge.svg)](https://github.com/ultralytics/.github/actions/workflows/format.yml)
+[![Ultralytics Actions](https://github.com/ultralytics/.github/actions/workflows/format.yml/badge.svg)](https://github.com/ultralytics/.github/actions/workflows/format.yml) <a href="https://ultralytics.com/discord"><img alt="Discord" src="https://img.shields.io/discord/1089800235347353640?logo=discord&logoColor=white&label=Discord&color=blue"></a>
 
 ## 🎯 Purpose of this Repository