Update README.md

Author: api-postcode

README.md

@@ -11,7 +11,23 @@ Installation is a quick step process:
 
 ### Step 1: Download php-client using composer
 
-
 ``` bash
 $ composer require api-postcode/php-client
 ```
+
+
+Usage
+-----
+``` php
+$token = 'secret-token';
+$client = new ApiPostcode\Client($token);
+
+$address = $client->fetchAddress('1012JS', 1);
+
+$address->getStreet();      // Dam
+$address->getCity();        // Amsterdam
+$address->getHouseNumber(); // 1
+$address->getZipCode();     // 1012JS
+$address->getLatitude();    // 52.3732926
+$address->getLongitude();   // 4.8937176
+```