add attendees export

app/Http/Controllers/Export/MeetupEventAttendeesExportController.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace App\Http\Controllers\Export;
+
+use App\Exports\MeetupEventAttendeesExport;
+use App\Http\Controllers\Controller;
+use App\Models\MeetupEvent;
+use Illuminate\Http\Request;
+
+class MeetupEventAttendeesExportController extends Controller
+{
+    /**
+     * Handle the incoming request.
+     */
+    public function __invoke(Request $request, MeetupEvent $meetupEvent)
+    {
+        return (new MeetupEventAttendeesExport($meetupEvent))->download($meetupEvent->start->toDateString().'_'.$meetupEvent->meetup->slug.'.xlsx');
+    }
+}