add set elements

backend/app/Set/Set.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Set;
+
+class Set
+{
+    public function __construct(
+        private int $id,
+        private string $name,
+    ) {}
+
+    public function getId(): int
+    {
+        return $this->id;
+    }
+
+    public function getName(): string
+    {
+        return $this->name;
+    }
+}