Added readme

Author: Nyholm

README.md

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+# PSR-6 Session handler
+[![Latest Stable Version](https://poser.pugx.org/cache/session-handler/v/stable)](https://packagist.org/packages/cache/session-handler) [![codecov.io](https://codecov.io/github/php-cache/session-handler/coverage.svg?branch=master)](https://codecov.io/github/php-cache/session-handler?branch=master) [![Build Status](https://travis-ci.org/php-cache/session-handler.svg?branch=master)](https://travis-ci.org/php-cache/session-handler) [![Total Downloads](https://poser.pugx.org/cache/session-handler/downloads)](https://packagist.org/packages/cache/session-handler)  [![Monthly Downloads](https://poser.pugx.org/cache/session-handler/d/monthly.png)](https://packagist.org/packages/cache/session-handler) [![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE)
+
+This is a PHP session handler that supports PSR-6 cache. It is a part of the PHP Cache organisation. Find more 
+documentation at [www.php-cache.com](http://www.php-cache.com). 
+
+
+### Install
+
+```bash
+composer require cache/session-handler
+```
+
+### Configure
+
+```php
+$pool = new ArrayCachePool();
+$config = ['ttl'=>3600, 'prefix'=>'foobar'];
+
+$sessionHandler = new Psr6SessionHandler($pool, $config);
+```
+
+### Contribute
+
+Contributions are very welcome! Send us a pull request or report any issues you find on the [issue tracker](https://github.com/php-cache/issues/issues).