[WIP] Getting started with phpcr odm

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes 
| Applies to    | all
| Fixed tickets | 

This document aims to get the user started with a Symfony SE installation based PHPCR-ODM project. Iplanned for it to contain instructions on setting up Jackrabbit etc. but that is in conflict with the PHPCR ODM docs I imagine.

This is to accompany the Basic CMS tutorial if we choose NOT to use the distribution (although this will probably be useful in its own right).