Update README.md

Author: KorStrix

README.md

@@ -4,6 +4,7 @@
 ![GitHub release (latest by date)](https://img.shields.io/github/v/release/unity-korea-community/unity-builder)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/b660c22a8710466cb44271b33b8fc92d)](https://app.codacy.com/gh/unity-korea-community/unity-builder?utm_source=github.com&utm_medium=referral&utm_content=unity-korea-community/unity-builder&utm_campaign=Badge_Grade_Settings)
 [![CI_SONAR_CLOUD](https://github.com/unity-korea-community/unity-builder/actions/workflows/sonarcloud-analysis.yml/badge.svg?branch=workspace)](https://github.com/unity-korea-community/unity-builder/actions/workflows/sonarcloud-analysis.yml)
+[![Discord](https://img.shields.io/discord/591914197219016707.svg?label=&logo=discord&logoColor=ffffff&color=7389D8&labelColor=6A7EC2)](https://discord.gg/FKXA2yzR)
 
 ## 소개