Merge branch 'add-default-page-for-root' into 'master'

Add default page for /

See merge request gitlab-org/project-templates/spring!4

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

 package com.example.demo;
 
-import org.springframework.boot.SpringApplication;
-import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.*;
+import org.springframework.boot.autoconfigure.*;
+import org.springframework.web.bind.annotation.*;
 
 @SpringBootApplication
+@RestController
 public class DemoApplication {
 
+	@RequestMapping("/")
+	String home() {
+		return "Spring is here!";
+	}
+
 	public static void main(String[] args) {
 		SpringApplication.run(DemoApplication.class, args);
 	}
-}
+}
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