Add documentation section about map creation

[blast007]

We don't have any documentation on our main website about map creation. The wiki has some information that could be migrated.

• Map objects
  • world
  • options
  • waterLevel
  • dynamicColor
  • textureMatrix
  • transform
  • material
  • physics
  • define
  • group
  • mesh
  • meshbox
  • meshpyr
  • arc
  • cone
  • sphere
  • tetra
  • box
  • pyramid
  • link
  • teleporter
  • base
  • weapon
  • zone
• Using 3D modeling software and converting to BZW
• Running bzfs for testing maps

https://wiki.bzflag.org/Category:Map_Making
https://wiki.bzflag.org/World_units

[TheGiraffe3]

Where would you suggest we put this information?