Updated readme (#688)

Author: Nyholm

Readme.md

@@ -1,10 +1,22 @@
-# Common classes for the Geocoder
-[![Build Status](https://travis-ci.org/geocoder-php/php-common.svg?branch=master)](http://travis-ci.org/geocoder-php/php-common)
-[![Latest Stable Version](https://poser.pugx.org/willdurand/geocoder/v/stable)](https://packagist.org/packages/willdurand/geocoder)
-[![Total Downloads](https://poser.pugx.org/willdurand/geocoder/downloads)](https://packagist.org/packages/willdurand/geocoder)
-[![Monthly Downloads](https://poser.pugx.org/willdurand/geocoder/d/monthly.png)](https://packagist.org/packages/willdurand/geocoder)
+# Common classes for HTTP based Geocoders
+
+[![Build Status](https://travis-ci.org/geocoder-php/php-common-http.svg?branch=master)](http://travis-ci.org/geocoder-php/php-common-http)
+[![Latest Stable Version](https://poser.pugx.org/geocoder-php/common-http/v/stable)](https://packagist.org/packages/geocoder-php/common-http)
+[![Total Downloads](https://poser.pugx.org/geocoder-php/common-http/downloads)](https://packagist.org/packages/geocoder-php/common-http)
+[![Monthly Downloads](https://poser.pugx.org/geocoder-php/common-http/d/monthly.png)](https://packagist.org/packages/geocoder-php/common-http)
 [![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE)
 
+This package has dependency on HTTP related libraries. Such as the great [HTTPlug](http://httplug.io/) and [PSR7](http://www.php-fig.org/psr/psr-7/).
+It does contain a an `AbstractHttpProvider`. 
+
+### Install
+
+In 99% of the cases you do **not** want to install this package directly. You are more likely to install one provider. 
+Have a look at [the documentation](https://github.com/geocoder-php/Geocoder) to see the different providers. 
+
+```bash
+composer require geocoder-php/common-http
+```
 
 ### Contribute