add set scheduling api

backend/app/Schedule/UseCases/CreateSchedule/CreateScheduleRequest.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Schedule\UseCases\CreateSchedule;
+
+use App\User\User;
+
+final readonly class CreateScheduleRequest
+{
+    public function __construct(
+        public User $user,
+        public ?int $setId,
+        public ?string $elementKind,
+        public ?string $startDate,
+        public ?string $targetDate,
+    ) {}
+}