Add php-cs-fixer

.php-cs-fixer.php

@@ -0,0 +1,21 @@
+<?php
+
+use PhpCsFixer\Config;
+use PhpCsFixer\Finder;
+
+$finder = Finder::create()
+    ->in(__DIR__)
+    ->name('*.php')
+    ->ignoreVCSIgnored(true);
+
+$config = new Config();
+
+$rules = [
+    '@PER-CS2.0'                  => true,
+    'trailing_comma_in_multiline' => ['elements' => ['arguments', 'array_destructuring', 'arrays']], // For PHP 7.4 compatibility
+];
+
+return $config
+    ->setRules($rules)
+    ->setFinder($finder)
+    ->setUsingCache(false);