Added API info.

README.md

@@ -1,2 +1,23 @@
 # Advanced Vehicles
-Adds smart different cars (passenger cars, trucks, buses, service). 
+Adds smart different cars (passenger cars, trucks, buses, service). This mod introduces little API to register cars with analogical parameters that use the mod (see *API Documentation)
+
+## API Documentation
+###adv_vehicles.register_vehicle(vehicle_name, vehicle_properties, vehicle_item)
+
+*vehicle_name* is entity string.
+*vehicle_properties* is a table with following fields:
+     hp_max,
+     mass,   is a property that sets a value of vehicle mass in tons. Necessary for calculating of the gravity.
+     max_vel,  measured in metres in sec.
+     cbox,  is collision box.
+     model,
+     textures,
+     seats, is a table that contains a data about each seat (busy_by, pos fields). Key should be string containing a sort of seat (driver or passenger).
+     player_eye_offset, is pos table
+*vehicle_item* is a table with item spawner data. Fields: description, inv_image, craft_recipe.
+
+
+
+*This documentation is in working progress.*
+     
+