Added readme

Author: lucasantarella

README.md

@@ -0,0 +1,75 @@
+Recursive PHP `array_keys()`!
+=============================
+
+[![Build Status](https://img.shields.io/travis/lucasantarella/php-array-keys-recursive/master.svg)](https://travis-ci.org/lucasantarella/php-array-keys-recursive)
+![License](https://img.shields.io/github/license/lucasantarella/php-array-keys-recursive.svg)
+![Issues](https://img.shields.io/bitbucket/issues/lucasantarella/php-array-keys-recursive.svg)
+
+## Description
+A simple library for getting the `array_keys()` of a multidimensional array.
+
+## Installation
+#### Composer
+```bash
+$ composer require lucasantarella/php-array-keys-recursive
+```
+
+## Usage
+```php
+<?php
+
+require_once __DIR__ . '/vendor/autoload.php';
+
+$input = [
+    'person' => [
+        'name' => [
+            'first' => 'Luca',
+            'middle' => 'Michele',
+            'last' => 'Santarella'
+        ],
+        'dob' => '11/11/1999',
+        'knowledge' => [
+            'programming' => [
+                'languages' => [
+                    'PHP',
+                    'JS',
+                    'HTML',
+                    'SQL',
+                    'JAVA'
+                ]
+            ]
+        ]
+    ]
+];
+
+$output = \LucaSantarella\ArrayKeysRecursive::getKeys($input);
+```
+#### Result
+```text
+array (
+  'person' => 
+  array (
+    'name' => 
+    array (
+      0 => 'first',
+      1 => 'middle',
+      2 => 'last',
+    ),
+    0 => 'dob',
+    'knowledge' => 
+    array (
+      'programming' => 
+      array (
+        'languages' => 
+        array (
+          0 => 0,
+          1 => 1,
+          2 => 2,
+          3 => 3,
+          4 => 4,
+        ),
+      ),
+    ),
+  ),
+)
+```

tests/ArrayKeysRecursiveTest.php

@@ -82,7 +82,6 @@ public function testGetKeys()
 	public function testGetKeysWithDepth()
 	{
 		$output = ArrayKeysRecursive::getKeys(self::$testArray, 2);
-		var_export($output);
 		$this->assertEquals([
 			'person' => [
 				'name' => [],