adds a route to return the list of food options in JSON format

controllers/controllers.php

@@ -50,6 +50,13 @@ $app->get('/new', function() use($app) {
   }
 });
 
+$app->get('/new/options.json', function() use($app) {
+  $app->response()['Content-Type'] = 'application/json';
+  $app->response()->body(json_encode(array(
+    'Caffeine' => caffeine_options(),
+    'Alcohol' => alcohol_options()
+  )));
+});
 
 
 $app->post('/prefs', function() use($app) {