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

code from pantheon

* code from pantheon

wp/wp-content/plugins/wordpress-seo/src/introductions/domain/introduction-item.php

@@ -0,0 +1,64 @@
+<?php
+
+namespace Yoast\WP\SEO\Introductions\Domain;
+
+/**
+ * Domain object that holds introduction information.
+ */
+class Introduction_Item {
+
+	/**
+	 * The ID.
+	 *
+	 * @var string
+	 */
+	private $id;
+
+	/**
+	 * The priority.
+	 *
+	 * @var int
+	 */
+	private $priority;
+
+	/**
+	 * Constructs the instance.
+	 *
+	 * @param string $id       The ID.
+	 * @param int    $priority The priority.
+	 */
+	public function __construct( $id, $priority ) {
+		$this->id       = $id;
+		$this->priority = $priority;
+	}
+
+	/**
+	 * Returns an array representation of the data.
+	 *
+	 * @return array Returns in an array format.
+	 */
+	public function to_array() {
+		return [
+			'id'       => $this->get_id(),
+			'priority' => $this->get_priority(),
+		];
+	}
+
+	/**
+	 * Returns the ID.
+	 *
+	 * @return string
+	 */
+	public function get_id() {
+		return $this->id;
+	}
+
+	/**
+	 * Returns the requested pagination priority. Higher means earlier.
+	 *
+	 * @return int
+	 */
+	public function get_priority() {
+		return $this->priority;
+	}
+}