Update README.md

Author: StephenHodgson

README.md

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 # Buildalon unity-uwp-builder
 
+[![Discord](https://img.shields.io/discord/939721153688264824.svg?label=&logo=discord&logoColor=ffffff&color=7389D8&labelColor=6A7EC2)](https://discord.gg/VM9cWJ9rjH) [![marketplace](https://img.shields.io/static/v1?label=&labelColor=505050&message=Buildalon%20Actions&color=FF1E6F&logo=github-actions&logoColor=0076D6)](https://github.com/marketplace?query=buildalon) [![validate](https://github.com/buildalon/unity-uwp-builder/actions/workflows/validate.yml/badge.svg?branch=main)](https://github.com/buildalon/unity-uwp-builder/actions/workflows/validate.yml)
+
 A GitHub Action to build Unity exported UWP projects.
 
 > [!NOTE]