FEATURE: add functionality for creating new widget.

This commit adds functionality for creating widget of whatever type. Controller calls widget admin handler, which renders and handles input form.

app/Http/Requests/NewWidgetRequest.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Http\Requests;
+
+class NewWidgetRequest extends Request
+{
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        return [
+            'name' => 'required'
+        ];
+    }
+}