docs: add swagger

app/Providers/Swagger.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Providers;
+
+use Carbon\Laravel\ServiceProvider;
+use L5Swagger\L5SwaggerServiceProvider;
+
+/**
+ * @OA\Info(
+ *     title="Working Days API",
+ *     version="1.0.0",
+ * )
+ */
+class Swagger extends ServiceProvider
+{
+    public function register()
+    {
+        $this->app->register(L5SwaggerServiceProvider::class);
+    }
+}