move code to repository root

ecs.php

@@ -0,0 +1,18 @@
+<?php declare(strict_types=1);
+
+use Lubiana\CodeQuality\LubiSetList;
+use Symplify\EasyCodingStandard\Config\ECSConfig;
+
+return static function (ECSConfig $c): void {
+    $c->parallel();
+    $c->paths([
+        __DIR__ . '/src',
+        __DIR__ . '/config',
+        __DIR__ . '/ecs.php',
+        __DIR__ . '/rector.php',
+    ]);
+
+    $c->sets([
+        LubiSetList::ECS,
+    ]);
+};