FEATURE #1526: add simple photogallery

Photogallery currently works with directories, UI is terrible, but it works.

modules/Gallery/Config/config.php

@@ -0,0 +1,12 @@
+<?php
+
+return [
+    'name'      => 'Gallery',
+    'translatedName' => 'gallery::module.name',
+    'translatedDescription' => 'gallery::module.description',
+    'alias'     => 'gallery',
+    'handler'   => '\\Modules\\Gallery\\Handlers\\Gallery',
+    'providers' => [\Modules\Gallery\Providers\GalleryServiceProvider::class],
+    'files'     => ['start.php'],
+    'order'     => 0,
+];