Add default phpcs file

Author: dcsg

phpcs.xml.dist

@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+<ruleset name="php-immutable-collections">
+    <description>The coding standard of PHP Immutable Collections package</description>
+    <arg value="p" />
+
+    <config name="ignore_warnings_on_exit" value="1" />
+    <config name="ignore_errors_on_exit" value="1" />
+
+    <arg name="colors" />
+    <arg value="s" />
+
+    <rule ref="PSR2" />
+</ruleset>