Added info how to configure the HTTP client

Author: Nyholm

README.md

@@ -527,6 +527,7 @@ Cookbook
 We have a small cookbook where you can find examples on common use cases: 
 
 * [Caching responses](/docs/cookbook/cache.md)
+* [Configuring the HTTP client](/docs/cookbook/http-client.md)
 
 
 Contributing

docs/cookbook/http-client.md

@@ -0,0 +1,47 @@
+# Configuring the HTTP client
+
+The Geocoder is decoupled from the HTTP client that sends the HTTP messages. This means
+that you are responsible for configuring the HTTP client. Usually the default configuration
+is good enough but sometime you may want to do something differently. 
+
+How you configure the client differs between different clients below are two examples,
+one with [Guzzle6 client](https://github.com/guzzle/guzzle) and one with the 
+[cURL client](https://github.com/php-http/curl-client).
+
+## Guzzle6
+
+```php
+use GuzzleHttp\Client as GuzzleClient;
+use Http\Adapter\Guzzle6\Client;
+use Geocoder\Provider\GoogleMaps;
+
+$config = [
+    'timeout' => 2.0,
+    'verify' => false,
+];
+$guzzle = new GuzzleClient($config);
+
+$adapter  = new Client($guzzle);
+$geocoder = new GoogleMaps($adapter);
+
+$geocoder->geocode(...);
+```
+
+
+## cURL
+
+```php
+use Http\Client\Curl\Client;
+use Geocoder\Provider\GoogleMaps;
+
+$options = [
+    CURLOPT_CONNECTTIMEOUT => 2, 
+    CURLOPT_SSL_VERIFYPEER => false,
+];
+
+$adapter  = new Client(null, null, $options);
+$geocoder = new GoogleMaps($adapter);
+
+$geocoder->geocode(...);
+```
+