fixes post example.

README.md

@@ -10,7 +10,7 @@
    4. curl http://localhost:8080/restApp/sample/persons
    5. curl  -H "Content-Type: application/json" \
       -X POST \
-      -d '{"name":"Jeanne"}'  \
+      -d '{"Person":{"name":"Jeanne"}}'  \
       http://localhost:8080/restApp/sample/persons
    6. curl http://localhost:8080/restApp-1.0-SNAPSHOT/resources/sample/persons/843c8236-6c6b-450e-9aa3-211a9b897403
    7. curl -H "Accept: text/xml" http://localhost:8080/restApp-1.0-SNAPSHOT/resources/sample/persons