This commit creates the Murano docs structure:
1. adds the draft folder that will be removed from the
directory when the doc development process is over;
2. adds 4 separate folders for four types of guides
(end user, admin user, app developer, and contributor),
and 3 more folders for intro, appendix and images;
To build the docs, please run $ sphinx-build doc/source doc/build
from the root directory.
Change-Id: I8594b01eddb0ac6cd8ce9d63553d93a1d9232ebd
e7370c7c96