Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/plugins/wordpress-seo/src/promotions/domain/black-friday-promotion.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Yoast\WP\SEO\Promotions\Domain;
+
+/**
+ * Class to manage the Black Friday promotion.
+ */
+class Black_Friday_Promotion extends Abstract_Promotion implements Promotion_Interface {
+
+	/**
+	 * Class constructor.
+	 */
+	public function __construct() {
+		parent::__construct(
+			'black-friday-2023-promotion',
+			new Time_Interval( \gmmktime( 11, 00, 00, 11, 23, 2023 ), \gmmktime( 11, 00, 00, 11, 28, 2023 ) )
+		);
+	}
+}