Modify DemoApplication class

Add UserController class

src/main/java/com/example/demo/DemoApplication.java

@@ -8,6 +8,7 @@ public class DemoApplication {
 
 	public static void main(String[] args) {
 		System.out.println("Start application");
+		System.out.println("Second println");
 		SpringApplication.run(DemoApplication.class, args);
 	}
 

src/main/java/controller/UserController.java

@@ -0,0 +1,4 @@
+package controller;
+
+public class UserController {
+}