add set scheduling api

backend/app/Schedule/ScheduleRepository.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Schedule;
+
+use App\User\User;
+
+interface ScheduleRepository
+{
+    public function create(CreateScheduleDto $dto): Schedule;
+
+    public function findForUser(int $id, User $user): ?Schedule;
+
+    /**
+     * @return list<Schedule>
+     */
+    public function findAllForUser(User $user): array;
+}