Documentation for contributors is here!

Hello everyone!,

As we announced during the past Drupalcamp Spain in Madrid we were working on the creation of a more detailed technical documentation. The idea was offering a starting point for contributors and developers to understand patterns code, providing an outer to inner overview, in a similar way we do while debugging the code.
The new section has been named: "Patterns 7.x for contributors: A tour of the code", and it covers the main functionalities and the whole patterns execution flow. We are planning to expand it in the future with documentation about the automatic export functionalities.

Thanks for reading/modifying/extending it!,

David