django-admin startproject gas_stations
python3 manage.py startapp stations
# settings.py - add 'stations' to INSTALLED_APPS 
# create models Company and Station in models.py
python3 manage.py makemigrations stations
python3 manage.py migrate
python3 manage.py shell
>> c = Company(name="Shell")
>> c.save()
>> s = Station(name="Poruba", cars_capacity=4, company=Company.objects.get(id=1))
>> s.save()
>> exit()
python3 manage.py createsuperuser
# open admin.py and add the following lines
  from stations.models import Company, Station
  admin.site.register(Company)
  admin.site.register(Station)
python3 manage.py runserver
# open your web browser 127.0.0.1:8000/admin/