[JAVA-9616] Add simple demo application for mvn wrapper

spring-boot-modules/spring-boot-artifacts/src/main/java/com/baeldung/wrapper/DemoApplication.java

@@ -0,0 +1,12 @@
+package com.baeldung.wrapper;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication(scanBasePackages = { "com.baeldung" })
+public class DemoApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(DemoApplication.class, args);
+    }
+}

spring-boot-modules/spring-boot-artifacts/src/main/java/com/baeldung/wrapper/DemoController.java

@@ -0,0 +1,15 @@
+package com.baeldung.wrapper;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+
+@Controller
+public class DemoController {
+
+    @GetMapping(value = "/demo")
+    public String demo(Model model) {
+        return "index";
+    }
+
+}