add outline and initial content for getting started document

At the Bologna Quattor Workshop, the attendees decided on the outline for a getting started document.  The focus of the document is to demonstrate to new users the capabilities of Quattor.  It was decided to use Aquilon and the yum-based SPMA for this tutorial/demonstration.

The outline is:
* Prerequisites concerning the hardware and site information
* Show how to install Aquilon server
* Demonstrate how to take control of client machine
* Step through the use case of making a configuration change on the client

For the configuration change, possible examples are: inserting SSH keys into an account, creating a new user account, or adding a new RPM package.

The end of the guide should provide pointers to further information, in particular to standard documentation, resources, and best practices.

After the initial document has been provided, then the "next steps" towards production use of Quattor could be:
* Installing a machine from scratch
* Configuring the entire system for security
* Information about common services