Add captcha image generation functionality.

app/Captcha/Dto/Sector.php

@@ -0,0 +1,45 @@
+<?php declare(strict_types=1);
+
+namespace App\Captcha\Dto;
+
+final readonly class Sector
+{
+    public function __construct(
+        private int $x,
+        private int $y,
+        private int $width,
+        private int $height,
+    ) { }
+
+    /**
+     * @return int
+     */
+    public function getX(): int
+    {
+        return $this->x;
+    }
+
+    /**
+     * @return int
+     */
+    public function getY(): int
+    {
+        return $this->y;
+    }
+
+    /**
+     * @return int
+     */
+    public function getWidth(): int
+    {
+        return $this->width;
+    }
+
+    /**
+     * @return int
+     */
+    public function getHeight(): int
+    {
+        return $this->height;
+    }
+}