#192 Adding screenshot

readme.md

@@ -12,6 +12,8 @@
 
 You can then access petclinic here: http://localhost:8080/
 
+<img width="1042" alt="petclinic-screenshot" src="https://cloud.githubusercontent.com/assets/838318/19727082/2aee6d6c-9b8e-11e6-81fe-e889a5ddfded.png">
+
 ## In case you find a bug/suggested improvement for Spring Petclinic
 Our issue tracker is available here: https://github.com/spring-projects/spring-petclinic/issues