Add php-cs-fixer setup

Exclude propel generated files from php-cs-fixer

legacy/.php-cs-fixer.php

@@ -0,0 +1,15 @@
+<?php
+
+$finder = PhpCsFixer\Finder::create()
+    ->in(__DIR__)
+    ->exclude('application/models/airtime/map')
+    ->exclude('application/models/airtime/om');
+
+$config = new PhpCsFixer\Config();
+return $config->setRules([
+    '@PhpCsFixer' => true,
+    'concat_space' => ['spacing' => 'one'],
+    'ordered_class_elements' => false,
+    'yoda_style' => false,
+])
+    ->setFinder($finder);