Documentation for the Buzz adapter (#115)

* Documentation for the Buzz adapter.
This will fix #99

* Typo

Author: Nyholm

clients.rst

@@ -20,6 +20,7 @@ Client adapters:
 
 .. toctree::
 
+   clients/buzz-adapter
    clients/guzzle5-adapter
    clients/guzzle6-adapter
    clients/react-adapter

clients/buzz-adapter.rst

@@ -0,0 +1,59 @@
+Buzz Adapter
+============
+
+An HTTPlug adapter for the `Buzz HTTP client`_.
+
+Installation
+------------
+
+To install the Buzz adapter, which will also install Buzz itself (if it was
+not yet included in your project), run:
+
+.. code-block:: bash
+
+    $ composer require php-http/buzz-adapter
+
+.. include:: includes/install-message-factory.inc
+
+.. include:: includes/install-discovery.inc
+
+Usage
+-----
+
+Begin by creating a Buzz client, you may pass any listener or configuration parameters to it
+like::
+
+    use Buzz\Browser;
+    use Buzz\Client\Curl;
+    use Buzz\Listener\CookieListener;
+
+    $browser = new Browser();
+
+    $client = new Curl();
+    $client->setMaxRedirects(0);
+    $browser->setClient($client);
+
+    // Create CookieListener
+    $listener = new CookieListener();
+    $browser->addListener($listener);
+
+Then create the adapter::
+
+    use Http\Adapter\Buzz\Client as BuzzAdapter;
+    use Http\Message\MessageFactory\GuzzleMessageFactory;
+
+    $adapter = new BuzzAdapter($browser, new GuzzleMessageFactory());
+
+Or if you installed the :doc:`discovery </discovery>` layer::
+
+    use Http\Adapter\Buzz\Client as BuzzAdapter;
+
+    $adapter = new BuzzAdapter($browser);
+
+.. warning::
+
+    The message factory parameter is mandatory if the discovery layer is not installed.
+
+.. include:: includes/further-reading-sync.inc
+
+.. _Buzz HTTP client: https://github.com/kriswallsmith/Buzz