restore set creation

backend/app/Set/EloquentSetRepository.php

@@ -4,6 +4,15 @@ 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);