docs: README에 간단한 WebSocket 채팅 예제 프로젝트 링크 추가

Author: NARUBROWN

README.en.md

@@ -21,6 +21,7 @@ It does not hide how a request is resolved and executed.
 - Official site: https://spine.na2ru2.me/en/
 - Bun ORM + Swagger integration example project: https://github.com/NARUBROWN/spine-user-demo
 - Kafka MSA example project: https://github.com/NARUBROWN/spine-simple-msa-demo
+- Simple WebSocket chat example project: https://github.com/NARUBROWN/spine-simple-chat-demo
 
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README.md

@@ -21,6 +21,7 @@
 - 공식 사이트: https://spine.na2ru2.me/ko/
 - Bun ORM + Swagger 통합 예제 프로젝트: https://github.com/NARUBROWN/spine-user-demo
 - Kafka MSA 예제 프로젝트: https://github.com/NARUBROWN/spine-simple-msa-demo
+- 간단한 WebSocket 채팅 예제 프로젝트: https://github.com/NARUBROWN/spine-simple-chat-demo
 
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