add Behaviour trait

src/Potter/Event/Behaviour.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Potter\Event;
+
+use \Potter\Container;
+
+trait Behaviour 
+{
+    private static function addDispatcher(Container $container): void
+    {
+        $container->addShared(Dispatcher::class);
+    }
+    
+    private static function addEventBehaviour(Container $container): void
+    {
+        self::addDispatcher($container);
+    }
+}