updated readme with example

README.md

@@ -3,6 +3,39 @@ Behat\Mink
 
 * The main website with documentation is at [http://behat.org](http://behat.org)
 
+Usage
+-----
+
+    <?php
+
+    use Behat\Mink\Mink,
+        Behat\Mink\Driver\GoutteDriver,
+        Behat\Mink\Driver\SahiDriver;
+
+    $startUrl = 'http://example.com';
+
+    // init Mink and register drivers
+    $mink = new Mink('goutte', 'sahi');
+    $mink->registerDriver('goutte',     new GoutteDriver($startUrl), true);  // last argumen === isDefault
+    $mink->registerDriver('sahi',       new SahiDriver($startUrl, 'firefox'));
+    $mink->registerDriver('symfony2',   new GoutteDriver($startUrl, $container->get('client')));
+    $mink->registerDriver('custom',     new MyCustomDriver($startUrl));
+
+    // run in default driver ("goutte" is default driver - can be changed through setDefaultDriver($name))
+    $mink->switchToDefaultDriver();
+    $mink->getSession()->getPage()->findLink('Downloads')->click();
+    echo $mink->getSession()->getPage()->getContent();
+
+    // run in js driver ("sahi" is default js driver - can be changed through setJavascriptDriver($name))
+    $mink->switchToDriver('javascript');
+    $mink->getSession()->getPage()->findLink('Downloads')->click();
+    echo $mink->getSession()->getPage()->getContent();
+
+    // run in custom driver
+    $mink->switchToDriver('custom');
+    $mink->getSession()->getPage()->findLink('Downloads')->click();
+    echo $mink->getSession()->getPage()->getContent();
+
 Copyright
 ---------