Add php_code_sniffer config file

.gitignore

@@ -5,6 +5,7 @@
 !/.editorconfig
 !/.scrutinizer.yml
 !/.travis.yml
+!/.php_cs
 !/.github/
 
 # Others #

.php_cs

@@ -0,0 +1,18 @@
+<?php
+// PHP CS Fixer config file
+
+
+$finder = Symfony\CS\Finder\DefaultFinder::create()
+    ->exclude('html/includes/geshi')
+    ->exclude('html/includes/jpgraph')
+    ->exclude('html/includes/Slim')
+    ->exclude('html/lib')
+    ->exclude('lib')
+    ->exclude('logs')
+    ->exclude('mibs')
+    ->exclude('rrd')
+    ->in(__DIR__);
+
+return Symfony\CS\Config\Config::create()
+    ->level(Symfony\CS\FixerInterface::PSR2_LEVEL)
+    ->finder($finder);