Research and document process for importing custom drone models into AirSim

[mrouie]

AirSim allows you to set any uasset to be the drone used.
The actual physical characteristics of the drone are set elsewhere (See relevant issue)

Here are a few resources to get you started:

• How to make a custom drone? microsoft/AirSim#838
• https://microsoft.github.io/AirSim/settings/#pawnpaths

Possibly useful resources:

• Unreal Engine 4.27 Documentation - Using Datasmith with CAD File Formats
• Reddit - r/unrealengine: "Is there anyway to convert a CAD file into the engine?"
• How to change AirSim standart drone mesh to my drone or standart car to my car microsoft/AirSim#3433