added PHP CS Fixer config

.php_cs.dist

@@ -0,0 +1,14 @@
+<?php
+
+return PhpCsFixer\Config::create()
+    ->setRules(array(
+        '@Symfony' => true,
+        '@Symfony:risky' => true,
+        'array_syntax' => array('syntax' => 'long'),
+        'php_unit_fqcn_annotation' => false,
+        'no_unreachable_default_argument_value' => false,
+        'heredoc_to_nowdoc' => false,
+    ))
+    ->setRiskyAllowed(true)
+    ->setFinder(PhpCsFixer\Finder::create()->in(__DIR__))
+;