feat: add quit method to App class (#519)

* feat: add quit method to App class

* Method for facade added

Author: WINBIGFOX

src/App.php

@@ -8,6 +8,11 @@ class App
 {
     public function __construct(protected Client $client) {}
 
+    public function quit(): void
+    {
+        $this->client->post('app/quit');
+    }
+
     public function focus(): void
     {
         $this->client->post('app/focus');

src/Facades/App.php

@@ -5,6 +5,7 @@
 use Illuminate\Support\Facades\Facade;
 
 /**
+ * @method static void quit()
  * @method static void focus()
  * @method static void hide()
  * @method static bool isHidden()