Creation of the model directory which contains:
- Engine.cpp to store data from the PBF file with handlers.
- PlaceHandler.h to fill Place object.
- MainHandler.h to compute the routing.
- Place.cpp to store name and coordinates of a node.

Every prototype's functions of Engine, Place and PlaceHandler are operational (for now).

And creation of the doxygen documentation with:
- a directory for HTML output.
- a directory for LaTeX output.
- a configuration file.