Add README.md

Author: rboonzaijer

README.md

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+# PhpArrayToXml
+
+Convert an array to XML with PHP
+
+[![License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE.md)
+[![Build Status](https://img.shields.io/travis/refactorstudio/php-array-to-xml/master.svg?style=flat-square)](https://travis-ci.org/refactorstudio/php-array-to-xml)
+
+## Usage
+
+Basic example:
+```php
+use RefactorStudio\PhpArrayToXml\PhpArrayToXml;
+
+$converter = new PhpArrayToXml();
+
+$result = $converter->toXmlString(['title' => 'My Products']);
+```
+
+Output:
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<root><title>My Products</title></root>
+```