add nova

nova/src/HasMenu.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Laravel\Nova;
+
+use Illuminate\Http\Request;
+
+interface HasMenu
+{
+    /**
+     * Build the menu that renders the navigation links for the tool.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @return mixed
+     */
+    public function menu(Request $request);
+}