Added CS Fixer config

Author: gplanchat

.php-cs-fixer.dist.php

@@ -0,0 +1,39 @@
+<?php
+
+$finder = (new PhpCsFixer\Finder())
+    ->in('src')
+;
+
+return (new PhpCsFixer\Config())
+    ->setRiskyAllowed(true)
+    ->setRules([
+        '@PHP81Migration' => true,
+        '@PHP80Migration:risky' => true,
+        '@PHPUnit84Migration:risky' => true,
+        '@PSR1' => true,
+        '@PSR12' => true,
+        '@PhpCsFixer' => true,
+        '@Symfony' => true,
+        'ternary_to_elvis_operator' => true,
+        'set_type_to_cast' => true,
+        'self_accessor' => true,
+        'psr_autoloading' => true,
+        'php_unit_test_annotation' => ['style' => 'annotation'],
+        'php_unit_set_up_tear_down_visibility' => true,
+        'php_unit_construct' => true,
+        'no_useless_sprintf' => true,
+        'no_homoglyph_names' => true,
+        'native_function_invocation' => true,
+        'native_constant_invocation' => true,
+        'modernize_types_casting' => true,
+        'logical_operators' => true,
+        'is_null' => true,
+        'function_to_constant' => true,
+        'fopen_flag_order' => true,
+        'error_suppression' => true,
+        'ereg_to_preg' => true,
+        'dir_constant' => true,
+    ])
+    ->setFinder($finder)
+    ->setCacheFile('.php-cs-fixer.cache') // forward compatibility with 3.x line
+;