Adding a New Model

1. Find or create a new python module under src/pubg_client/models/

   from ._base import Mapping, Model
   
   
   class NewModel(Model):
   
       key_map = {
           'key': Mapping('key_in_api', type)
       }
   

2. If needed, define a load, next, and previous method.

3. If appropriate, register it as the deserializer for an endpoint (or in another models key map)