Enhancement: Enable PSR12 rule set

Author: localheinz

.php-cs-fixer.php

@@ -9,6 +9,8 @@
     ->in(__DIR__)
     ->name(__FILE__);
 
-$config->setRules([]);
+$config->setRules([
+    '@PSR12' => true,
+]);
 
 return $config;