add installation instructions to README.md

README.md

@@ -1,3 +1,30 @@
 # My very opiniated Configurations for Rector and ECS
 
+## Installation
+
+```bash
+composer require --dev lubiana/code-quality
+```
+
+Add my Setlist to ECS in `ecs.php`:
+
+```php
+return static function (\Symplify\EasyCodingStandard\Config\ECSConfig $config): void {
+    $config->sets([
+        \Lubiana\CodeQuality\LubiSetList::ECS,
+    ]);
+};
+```
+
+And for rector.php:
+
+```php
+return static function (\Rector\Config\RectorConfig $config): void {
+    $config->sets([
+        \Lubiana\CodeQuality\LubiSetList::RECTOR,
+    ]);
+};
+```
+
+