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README.md

@@ -4,3 +4,41 @@ This plugin checks what's inside the files.
 
 
 [![Tests](https://github.com/faissaloux/pest-plugin-inside/actions/workflows/tests.yml/badge.svg)](https://github.com/faissaloux/pest-plugin-inside/actions/workflows/tests.yml) ![Codecov](https://img.shields.io/codecov/c/github/faissaloux/pest-plugin-inside) ![Packagist Version](https://img.shields.io/packagist/v/faissaloux/pest-plugin-inside) ![Packagist License](https://img.shields.io/packagist/l/faissaloux/pest-plugin-inside)
+
+### Success
+
+```php
+<?php
+
+// lowercase.php
+
+return [
+    'lower',
+    'case',
+    'lowercase',
+];
+
+```
+
+```php
+expect('lowercase.php')->toReturnLowercase();
+```
+
+### Failure
+
+```php
+<?php
+
+// notlowercase.php
+
+return [
+    'lower',
+    'caSe',
+    'lowercase',
+];
+
+```
+
+```php
+expect('notlowercase.php')->toReturnLowercase();
+```