users weekly stats as bar-chart in dashboard (#847)

src/Widget/WidgetContainerInterface.php

@@ -0,0 +1,24 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Widget;
+
+interface WidgetContainerInterface extends WidgetInterface
+{
+    public function getOrder(): int;
+
+    public function setOrder(int $order);
+
+    /**
+     * @return WidgetInterface[]
+     */
+    public function getWidgets(): array;
+
+    public function addWidget(WidgetInterface $widget);
+}