Add fixtures to create on object per model

unisportomat/media/logo.png

unisportomat/media/test_image.png

unisportomat/quiz/fixtures/calls_to_move.json

unisportomat/quiz/fixtures/criteria.json

unisportomat/quiz/fixtures/criterion_ratings.json

unisportomat/quiz/fixtures/images/logo.png

unisportomat/quiz/fixtures/knowledge_snacks.json

unisportomat/quiz/fixtures/questions.json

unisportomat/quiz/tests.py