Add Composer autoloading functions and PHPStan for testing

vendor/symfony/console/Descriptor/DescriptorInterface.php

@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Console\Descriptor;
+
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Descriptor interface.
+ *
+ * @author Jean-François Simon <contact@jfsimon.fr>
+ */
+interface DescriptorInterface
+{
+    /**
+     * Describes an object if supported.
+     *
+     * @param OutputInterface $output
+     * @param object          $object
+     * @param array           $options
+     */
+    public function describe(OutputInterface $output, $object, array $options = []);
+}