create dev/test_api

create dev/manage.py

update dev/api/wsgi.py

create dev/api/wsgi.py

create dev/api/settings.py

create dev/api/urls.py

create dev/api/views.py

update dev/requirements.txt

create dev/test_solution.py

create dev/requirements.txt

update dev/solution.py

create dev/jj

delete demo/df.md

create demo/df.md

update spec/codex.md

update spec/codex.md

create spec/fff.md