spring boot custom banner (#1412)

* adding ratpack module

* adding pom.xml

* adding following modules with updated testcase : DB, Filter, Json

* adding spring-boot custom banner tutorial

spring-boot/src/main/resources/application.properties

@@ -33,3 +33,11 @@ logging.level.org.springframework=INFO
 #Servlet Configuration
 servlet.name=dispatcherExample
 servlet.mapping=/dispatcherExampleURL
+
+#banner.charset=UTF-8
+#banner.location=classpath:banner.txt
+#banner.image.location=classpath:banner.gif
+#banner.image.width= //TODO
+#banner.image.height= //TODO
+#banner.image.margin= //TODO
+#banner.image.invert= //TODO