Added README doc.

Renamed example/roc_api to demo.
Added contracts

examples/demo/site/www/themes/api/master2/error.tpl

@@ -0,0 +1,18 @@
+<h3> Error: {$code/} </h3>
+
+{assign name="status400" value="400"/}
+{assign name="status404" value="404"/}
+{assign name="status500" value="500"/}
+
+{if condition="$code ~ $status500"}
+	<p>Internal server error,  for the request <strong>{$request/}</string>  </p>
+{/if}
+
+
+{if condition="$code ~ $status404"}
+	<p>  Resourse not found,  for the request <strong>{$request/}</string>  </p>
+{/if}
+
+{if condition="$code ~ $status400"}
+	<p> Bad request, the request <strong>{$request/}</string> is not valid</p>
+{/if}