Added data models and first alembic migration

compendium_v2/__init__.py

compendium_v2/db/__init__.py

compendium_v2/db/models.py

compendium_v2/db/survey.py

compendium_v2/migrations/README

compendium_v2/migrations/alembic.ini

compendium_v2/migrations/env.py

compendium_v2/migrations/script.py.mako

...s/20221128_1223_1e8ba780b977_initial_data_entry_models.py

requirements.txt

test/conftest.py

tox.ini