Add rector config

Author: funivan

rector.php

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\CodeQuality\Rector\Class_\InlineConstructorDefaultToPropertyRector;
+use Rector\Config\RectorConfig;
+use Rector\PHPUnit\Set\PHPUnitSetList;
+use Rector\Set\ValueObject\LevelSetList;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->paths([
+        __DIR__ . '/test',
+        __DIR__ . '/src',
+    ]);
+
+
+    // define sets of rules
+    $rectorConfig->sets([LevelSetList::UP_TO_PHP_81, PHPUnitSetList::PHPUNIT_100,]);
+};