[cookbook] [deployment] added cookbook showing how to deploy to the Microsoft Azure Website Cloud

The SensioLabs & Microsoft Azure staff recently collaborated to write this tutorial together to promote the Azure Website cloud platform. This tutorial is a step by step guide describing how to deploy a Symfony Standard Edition to Azure.

In a near future, the goal is also to expand the `Deployment` section of the Cookbooks to other famous hosting providers.
I'd vote to always use the forward slash as the directory separator.