feat: 유저 API 응답 기능 구현

src/main/java/slvtwn/khu/toyouserver/common/ToyouResponse.java

@@ -0,0 +1,9 @@
+package slvtwn.khu.toyouserver.common;
+
+// TODO: 효율적인 예외처리 Wrapping 과정에 대해 고민
+public record ToyouResponse<T>(String code, T data) {
+
+    public static <T> ToyouResponse<T> success(T data) {
+        return new ToyouResponse<>("SUCCESS", data);
+    }
+}

src/main/java/slvtwn/khu/toyouserver/user/controller/UserController.java

@@ -0,0 +1,25 @@
+package slvtwn.khu.toyouserver.user.controller;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RestController;
+import slvtwn.khu.toyouserver.common.ToyouResponse;
+import slvtwn.khu.toyouserver.user.dto.UserResponse;
+import slvtwn.khu.toyouserver.user.service.UserService;
+
+@RequiredArgsConstructor
+@RestController
+public class UserController {
+
+    private final UserService userService;
+
+    @GetMapping("/users/{userId}")
+    public ToyouResponse<UserResponse> findUser(@PathVariable Long userId) {
+        UserResponse userResponse = userService.findUser(userId);
+
+        return ToyouResponse.success(userResponse);
+    }
+}