Rules optional, add readme

Author: n.gnato

README.md

@@ -0,0 +1,24 @@
+# Набор правил php-cs-fixer для Студсервис
+
+## Install
+
+```shell
+composer require --dev studservis/php-cs-fixer-ruleset
+```
+
+## Usage
+
+```php
+<?php
+// .php-cs-fixer.dist.php
+
+$finder = PhpCsFixer\Finder::create()
+    ->in([
+        './application/',
+        './tests/'
+       );
+
+$overridedProjectRules = [...];
+
+return \StudService\PhpCsFixer\build_config($finder, $overridedProjectRules);
+```

composer.json

@@ -1,5 +1,11 @@
 {
   "name": "studservis/php-cs-fixer-ruleset",
+  "authors": [
+    {
+      "name": "samizdam",
+      "email": "[email protected]"
+    }
+  ],
   "description": "StudService shared PHP style rules for PHP-CS-Fixer",
   "license": "MIT",
   "require": {

src/config_builder.php

@@ -5,7 +5,7 @@
 use PhpCsFixer\Config;
 use PhpCsFixer\ConfigInterface;
 
-function build_config(iterable $finder, array $rules): ConfigInterface
+function build_config(iterable $finder, array $rules = []): ConfigInterface
 {
     $rules = array_merge(require __DIR__.'/rules.php', $rules);