Add QEP 1

# DRAFT - QEP (QGIS Enhancement Proposal) 

**Stage: draft**

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 would propose to introduce a third level.

 * Technical (API)
 * GUI / Workflow (UX)
 * Process

That would allow a different group of voters for both. I think that people best suited for API/technical questions are not necessarily the same that are best suited for GUI/workflow questions. We could also have a "Standard" team which is expanded by one or two GUI experts if the QEP concerns UX. This could be preferred because there will probably often be an overlap. I think having dedicated members for this will help to get better feedback when it comes to UX.