Add a main.c

[ZynoXelek]

This main.c should be able to generate a map using user inputs.
It would use prompts (or command line parameters for the map dimensions and number of layers) to ask :

• seed
• map width
• map height
• nb layers

And, for each layer :

• grid width
• grid height
• layer factor

And finally, whether to save the map or not.