Added spring project files, modified DemoApplication.java

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

@@ -0,0 +1,14 @@
+package com.example.demo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class DemoApplication {
+
+	public static void main(String[] args) {
+        System.out.println("Start application");
+		SpringApplication.run(DemoApplication.class, args);
+	}
+
+}

src/main/resources/application.properties

@@ -0,0 +1 @@
+spring.application.name=demo