Enhancement: Add configuration for php-cs-fixer

.gitignore

@@ -1 +1,2 @@
+.php_cs.cache
 vendor

.php_cs

@@ -0,0 +1,41 @@
+<?php
+
+$config = new Symfony\CS\Config\Config();
+
+$config->getFinder()->in(__DIR__);
+
+return $config
+    ->level(Symfony\CS\FixerInterface::PSR2_LEVEL)
+    ->setUsingCache(true)
+    ->fixers([
+        'concat_with_spaces',
+        // 'double_arrow_multiline_whitespaces',
+        'duplicate_semicolon',
+        // 'empty_return',
+        'extra_empty_lines',
+        'include',
+        'join_function',
+        'multiline_array_trailing_comma',
+        // 'multiline_spaces_before_semicolon',
+        'namespace_no_leading_whitespace',
+        'new_with_braces',
+        'no_blank_lines_after_class_opening',
+        'no_empty_lines_after_phpdocs',
+        'object_operator',
+        'operators_spaces',
+        'ordered_use',
+        // 'phpdoc_indent',
+        // 'phpdoc_params',
+        'remove_leading_slash_use',
+        'remove_lines_between_uses',
+        'return',
+        'single_array_no_trailing_comma',
+        'short_array_syntax',
+        'spaces_before_semicolon',
+        'spaces_cast',
+        'standardize_not_equal',
+        'ternary_spaces',
+        'unused_use',
+        'whitespacy_lines',
+    ])
+;