Ajout du service pour récupérer les jours fériés (#1)

Reviewed-on: #1
Co-authored-by: kevin <kevin@yuno.malio.fr>
Co-committed-by: kevin <kevin@yuno.malio.fr>

src/Service/PublicHolidayServiceInterface.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service;
+
+interface PublicHolidayServiceInterface
+{
+    public function getHolidaysDay(string $zone): array;
+
+    public function getHolidaysDayByYears(string $zone, string $years): array;
+}