added introduction

Author: yamiko

components/browser_kit/index.rst

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+Browser Kit
+====
+
+.. toctree::
+    :maxdepth: 2
+
+    introduction

components/browser_kit/introduction.rst

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+.. index::
+   single: Yaml
+   single: Components; Yaml
+
+The Browser Kit Component
+=========================
+
+    The Browser Kit component simulates the behavior of a web browser.
+
+The Browser Kit component allows you to make web request, click on links and submit forms. 
+
+Installation
+------------
+
+You can install the component in 2 different ways:
+
+* :doc:`Install it via Composer </components/using_components>` (``symfony/browser-kit`` on `Packagist`_);
+* Use the official Git repository (https://github.com/symfony/BrowserKit).