chore: add UserService and Implementation for register

backend/src/main/java/com/greenfoxacademy/backend/BackendApplication.java

@@ -5,9 +5,9 @@
 
 @SpringBootApplication
 public class BackendApplication {
-  
+
   public static void main(String[] args) {
     SpringApplication.run(BackendApplication.class, args);
   }
-  
+
 }

backend/src/main/java/com/greenfoxacademy/backend/controller/HealthCheckController.java

@@ -11,9 +11,9 @@
  */
 @Controller
 public class HealthCheckController {
-  @GetMapping ("/health-check")
+  @GetMapping("/health-check")
   public ResponseEntity<String> healthCheck() {
     return new ResponseEntity<>("OK", HttpStatus.OK);
   }
-  
+
 }

backend/src/main/java/com/greenfoxacademy/backend/repositories/UserRepository.java

@@ -7,5 +7,4 @@
  * Repository to manage {@link User} entities.
  */
 public interface UserRepository extends JpaRepository<User, Integer> {
-
 }

backend/src/main/java/com/greenfoxacademy/backend/services/UserService.java

@@ -0,0 +1,13 @@
+package com.greenfoxacademy.backend.services;
+
+import com.greenfoxacademy.backend.models.User;
+import org.springframework.stereotype.Service;
+
+/**
+ * Service to manage {@link User} related actions.
+ */
+@Service
+public interface UserService {
+  void register(User newUser);
+
+}

backend/src/main/java/com/greenfoxacademy/backend/services/UserServiceImpl.java

@@ -0,0 +1,20 @@
+package com.greenfoxacademy.backend.services;
+
+import com.greenfoxacademy.backend.models.User;
+import com.greenfoxacademy.backend.repositories.UserRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+/**
+ * Service implementation to manage {@link UserService}.
+ */
+@Service
+@RequiredArgsConstructor
+public class UserServiceImpl implements UserService {
+  private final UserRepository userRepository;
+
+  @Override
+  public void register(User newUser) {
+    userRepository.save(newUser);
+  }
+}