merge into spring-boot module

spring-boot/src/main/java/org/baeldung/Application.java

@@ -0,0 +1,13 @@
+package org.baeldung;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.context.ApplicationContext;
+
+@org.springframework.boot.autoconfigure.SpringBootApplication
+public class Application {
+    private static ApplicationContext applicationContext;
+
+    public static void main(String[] args) {
+        applicationContext = SpringApplication.run(Application.class, args);
+    }
+}