Try to add online chat

src/main/java/site/easystartup/web/chat/repo/ChatRoomRepo.java

@@ -0,0 +1,8 @@
+package site.easystartup.web.chat.repo;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.repository.CrudRepository;
+import site.easystartup.web.chat.domain.model.ChatRoom;
+
+public interface ChatRoomRepo extends JpaRepository<ChatRoom, Long> {
+}