Install pyenv https://github.com/pyenv/pyenv and setup your system.
# Install the used python version if not already
pyenv install $(cat .python-version)
poetry install
# For psycopg2, install dependencies (For arch: https://github.com/archlinux/svntogit-community/blob/packages/python-psycopg2/trunk/PKGBUILD)
poetry shell
django-admin startapp <app-name>
poetry add package
poetry update --lock