[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.

This tutorial has been written by the following team:

Hugo Hamon – Head of training – SensioLabs
Thomas Conté – Technical Evangelist – Microsoft
Benjamin Moulès – Technical Evangelist - Microsoft 

In the near future, the goal is also to expand the Deployment section of the Cookbooks to other famous hosting providers.
I don't think there is anything wrong in mentioning that this is cowritten with Microsoft (I think it's good to mention that Symfony is working with the big companies). However, mentioning that it'll be announced at conf. X and the goals of the partnership, etc. seems off-topic for this doc for me and seems to fit better as a blog post