Add var docs

README.md

@@ -54,6 +54,11 @@ But at the same time you still WANT to implement **good practices** and **standa
     --standard The name or path of the coding standard. Defaults to PSR12.
 ```
 
+## Run tests
+```bash
+$ composer test
+```
+
 ### License
 
 ```

src/Main.php

@@ -80,7 +80,7 @@ public function __construct()
      *
      * @return void
      */
-    private function setUtil(Util $util): void
+    public function setUtil(Util $util): void
     {
         $this->util = $util;
     }

src/Util.php

@@ -19,6 +19,11 @@
 class Util
 {
 
+    /**
+     * Os util
+     *
+     * @var Os
+     */
     private $os;