Fix README

README.md

@@ -7,6 +7,8 @@ Example usage of a straightforward situation:
 ```php
 use \Parable\Di\Container;
 
+$container = new Container();
+
 $app = $container->get(App::class);
 $app->run();
 ```
@@ -16,6 +18,8 @@ Example usage of an interface-hinted dependency:
 ```php
 use \Parable\Di\Container;
 
+$container = new Container();
+
 class App
 {
     public function __construct(ThatInterface $classWithInterface)
@@ -35,6 +39,8 @@ Example usage of a class that needs the di itself:
 ```php
 use \Parable\Di\Container;
 
+$container = new Container();
+
 class App
 {
     public $container;