feat(models): add Country and NonWorkingDays models

database/seeders/CountrySeeder.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Database\Seeders;
+
+use App\Models\Country;
+use Illuminate\Database\Seeder;
+use Illuminate\Database\UniqueConstraintViolationException;
+
+class CountrySeeder extends Seeder
+{
+    private const array COUNTRIES = [
+        'CZ' => 'Czech Republic',
+    ];
+
+    /**
+     * Run the database seeds.
+     */
+    public function run(): void
+    {
+        foreach (static::COUNTRIES as $countryCode => $countryName) {
+            try {
+                Country::create(['country_code' => $countryCode, 'name' => $countryName]);
+            } catch (UniqueConstraintViolationException $e) {
+                // safe to ignore duplicate entries
+            }
+        }
+        //
+    }
+}