[BAEL-19881] - Rename spring-mvc-simple modules

spring-mvc-basics-3/src/main/java/com/baeldung/flash_attributes/Application.java

@@ -0,0 +1,14 @@
+package com.baeldung.flash_attributes;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
+
+@SpringBootApplication
+public class Application extends SpringBootServletInitializer {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+
+}