resource packs: added metadata to manifest models

src/resourcepacks/json/Manifest.php

@@ -44,4 +44,7 @@ final class Manifest{
 	 * @required
 	 */
 	public $modules;
+
+	/** @var ManifestMetadata */
+	public $metadata;
 }

src/resourcepacks/json/ManifestMetadata.php

@@ -0,0 +1,33 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+declare(strict_types=1);
+
+namespace pocketmine\resourcepacks\json;
+
+final class ManifestMetadata{
+	/** @var string[]|null */
+	public $authors = null;
+	/** @var string|null */
+	public $license = null;
+	/** @var string|null */
+	public $url = null;
+}