Add pre-populated Initializr link

to fill in the project settings, as a convenience.

README.adoc

@@ -33,7 +33,9 @@ include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/
 [[scratch]]
 == Starting with Spring Initializr
 
-To initialize the project:
+You can use this https://start.spring.io/#!type=maven-project&language=java&platformVersion=2.5.5&packaging=jar&jvmVersion=11&groupId=com.example&artifactId=messaging-stomp-websocket&name=messaging-stomp-websocket&description=Demo%20project%20for%20Spring%20Boot&packageName=com.example.messaging-stomp-websocket&dependencies=websocket[pre-initialized project] and click Generate to download a ZIP file. This project is configured to fit the examples in this tutorial.
+
+To manually initialize the project:
 
 . Navigate to https://start.spring.io.
 This service pulls in all the dependencies you need for an application and does most of the setup for you.