doc: readme

Author: adhocore

readme.md

@@ -0,0 +1,28 @@
+## adhocore/underscore
+
+[![Latest Version](https://img.shields.io/github/release/adhocore/underscore.svg?style=flat-square)](https://github.com/adhocore/underscore/releases)
+[![Travis Build](https://img.shields.io/travis/adhocore/underscore/master.svg?style=flat-square)](https://travis-ci.org/adhocore/underscore?branch=master)
+[![Scrutinizer CI](https://img.shields.io/scrutinizer/g/adhocore/underscore.svg?style=flat-square)](https://scrutinizer-ci.com/g/adhocore/underscore/?branch=master)
+[![Codecov branch](https://img.shields.io/codecov/c/github/adhocore/underscore/master.svg?style=flat-square)](https://codecov.io/gh/adhocore/underscore)
+[![StyleCI](https://styleci.io/repos/108437038/shield)](https://styleci.io/repos/108437038)
+[![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE)
+
+
+## Installation
+
+Requires PHP5.4 or later.
+
+```bash
+composer require adhocore/underscore
+
+```
+
+## Usage
+```php
+use Ahc\Underscore\Underscore;
+
+$u = new Underscore([1, 2, 3]);
+
+$u->contains(1); // true
+$u->contains(4); // false
+```