Add QEP 1

# DRAFT - QEP (QGIS Enhancement Proposal) 

This pull request adds the first QEP. QEP 1 itself will follow the QEP process of draft, vote, approval/redirection.  This QEP is in draft stage currently and will evolve with discussion.  

It's purpose, proposing this QEP as a QEP, is to build the QEP using the process the other proposals will follow.

Please read and add comments to the text in order to evolve it to a stage it it can be formalized. 
I think two days is a like short.