feat(models): add Country and NonWorkingDays models

app/Models/NonWorkingDays.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class NonWorkingDays extends Model
+{
+    protected $fillable = ['country_id', 'non_working_date'];
+}