Add rest_hello_world link to examples README

examples/README.md

@@ -10,6 +10,9 @@ parse and echo a GET query string
 * [echo_post](./echo_post):
 parse and echo a POST parameter
 
+* [rest_hello_world](./rest_hello_world):
+return the data type that matches the request type (ex: html, text, json...)
+
 * [chunked_hello_world](./chunked_hello_world):
 demonstrates chunked data transfer with two one-second delays