add set elements

backend/app/Set/EloquentSetRepository.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Set;
+
+class EloquentSetRepository implements SetRepository
+{
+    public function create(CreateSetDto $dto): Set
+    {
+        $model = SetModel::create([
+            'name' => $dto->name,
+        ]);
+
+        return $this->toDomain($model);
+    }
+
+    public function find(int $id): ?Set
+    {
+        $model = SetModel::find($id);
+
+        return $model === null ? null : $this->toDomain($model);
+    }
+
+    public function getAll(): array
+    {
+        $models = SetModel::orderBy('id')->get();
+        $sets = [];
+        foreach ($models as $model) {
+            $sets[] = $this->toDomain($model);
+        }
+
+        return $sets;
+    }
+
+    private function toDomain(SetModel $model): Set
+    {
+        return new Set(
+            id: $model->id,
+            name: $model->name,
+        );
+    }
+}