more simple an concise example of AbstractFactory

Creational/AbstractFactory/DigitalProduct.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace DesignPatterns\Creational\AbstractFactory;
+
+class DigitalProduct implements Product
+{
+    /**
+     * @var int
+     */
+    private $price;
+
+    public function __construct(int $price)
+    {
+        $this->price = $price;
+    }
+
+    public function calculatePrice(): int
+    {
+        return $this->price;
+    }
+}