restore composer.json, add mysqli extension

bootstrap/providers.php

@@ -0,0 +1,13 @@
+<?php
+
+return [
+    App\Providers\AppServiceProvider::class,
+    App\Providers\AuthServiceProvider::class,
+    App\Providers\BroadcastServiceProvider::class,
+    App\Providers\CustomRouteServiceProvider::class,
+    App\Providers\EventServiceProvider::class,
+    App\Providers\SettingProvider::class,
+    Jenssegers\Agent\AgentServiceProvider::class,
+    Maatwebsite\Excel\ExcelServiceProvider::class,
+    Intervention\Image\ImageServiceProvider::class,
+];