Map modding section needs completion

[FWolfe]

Map creation techniques and tools need detailing, as well as tips, tricks, and gotchas by someone with a fair amount of expertise in this field. A actual tutorial for this would be nice as well. I suspect this will be very image heavy (screenshots).

Ideally the main body of the section should be in github style markdown. For separate tutorials markdown should be preferred however some flexibility should be considered for easier viewing offline.