Add captcha image generation functionality.

app/Captcha/Dto/ImageHead.php

@@ -0,0 +1,18 @@
+<?php declare(strict_types=1);
+
+namespace App\Captcha\Dto;
+
+final readonly class ImageHead
+{
+    public function __construct(
+        private Image $image
+    ) { }
+
+    /**
+     * @return Image
+     */
+    public function getImage(): Image
+    {
+        return $this->image;
+    }
+}