chore: add code quality tools

.php-cs-fixer.dist.php

@@ -0,0 +1,12 @@
+<?php
+
+$finder = PhpCsFixer\Finder::create()
+    ->in(__DIR__.'/src');
+
+$config = new PhpCsFixer\Config();
+return $config->setRules([
+        '@Symfony' => true,
+        'full_opening_tag' => false,
+    ])
+    ->setFinder($finder)
+;