split models into separate apps, add pre-commit hooks

Makefile

contracts/__init__.py

contracts/admin.py

contracts/apps.py

contracts/migrations/0001_initial.py

contracts/migrations/0002_initial.py

contracts/migrations/__init__.py

contracts/models.py

contracts/tests.py

contracts/views.py

registry/settings/base.py

shared/models.py

users/__init__.py

users/admin.py

users/apps.py

users/migrations/0001_initial.py

users/migrations/__init__.py

users/models.py

users/tests.py

users/views.py