Update application.yml in Getting Started guide

Issue gh-1186

Closes gh-1519

docs/src/docs/asciidoc/examples/src/main/java/sample/gettingStarted/application.yml

@@ -7,6 +7,9 @@ logging:
 
 spring:
   security:
+    user:
+      name: user
+      password: password
     oauth2:
       authorizationserver:
         client: