BAEL-1318: Quick Guide to Setting up the Maven Wrapper on an Application (#3371)

* BAEL-1216: improve tests

* BAEL-1448: Update Spring 5 articles to use the release version

* Setting up the Maven Wrapper on a maven project

mvn-wrapper/src/main/java/com/baeldung/MvnWrapperApplication.java

@@ -0,0 +1,11 @@
+package com.baeldung;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class MvnWrapperApplication {
+	public static void main(String[] args) {
+		SpringApplication.run(MvnWrapperApplication.class, args);
+	}
+}