add responseformat endpoint method

src/main/java/ch/psi/daq/queryrest/controller/QueryRestController.java

@@ -352,6 +352,16 @@ public class QueryRestController {
       return Lists.newArrayList(Ordering.values());
    }
 
+   /**
+    * Returns the current list of {@link ResponseFormat}s available.
+    * 
+    * @return list of {@link Ordering}s as String array
+    */
+   @RequestMapping(value = "responseformat", method = {RequestMethod.GET}, produces = {MediaType.APPLICATION_JSON_VALUE})
+   public @ResponseBody List<ResponseFormat> getResponseFormatValues() {
+      return Lists.newArrayList(ResponseFormat.values());
+   }
+
    /**
     * Returns the current list of {@link QueryField}s available.
     *