Photoscene support was added 25th October 2017
Step 1 - Setup
Create a new Mod, Either from the Blank Template, or the New PhotoScene Template. Create or open a level.
Step 2 - Design a Level
This is not anything particular to Automation, but UE4 in General. Watch some of Epic's tutorials on this: https://www.youtube.com/watch?v=cl_eoVfNDKU&list=PLZlv_N0_O1gak1_FoAJVrEGiLIploeF3F
The only unique to Automation thing to remember is to add A_Car_Locator to determine where you want a car to spawn. You can have multiple in a level.