https://docs.djangoproject.com/en/1.8/topics/auth/default/#creating-users
Pelo terminal interativo do Python...
from django.contrib.auth.models import User
user = User.objects.create_user('john', '[email protected]', 'johnpassword')
user.last_name = 'Lennon'
user.save()
Pelo terminal do Linux...
python manage.py createsuperuser