automatic configuration for the bundle

DependencyInjection/Configuration.php

@@ -20,9 +20,13 @@ class Configuration implements ConfigurationInterface
         $treeBuilder = new TreeBuilder();
         $rootNode = $treeBuilder->root('cl_chill_main');
 
-        // Here you should define the parameters that are allowed to
-        // configure your bundle. See the documentation linked above for
-        // more information on that topic.
+        $rootNode
+                ->children()
+                  ->scalarNode('installation_name')
+                     ->cannotBeEmpty()
+                     ->defaultValue('Chill')
+                  ->end()
+                ->end();
 
         return $treeBuilder;
     }