Added a JobCode value object

Author: gplanchat

src/JobCode.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kiboko\Component\Workflow;
+
+use Kiboko\Contract\Satellite\CodeInterface;
+
+final class JobCode implements CodeInterface
+{
+    private function __construct(
+        private string $reference,
+    ) {}
+
+    public static function fromString(string $reference): self
+    {
+        return new self($reference);
+    }
+
+    public function __toString(): string
+    {
+        return $this->reference;
+    }
+}