Feat/meal module

backend/secfit/meals/__init__.py

backend/secfit/meals/admin.py

backend/secfit/meals/apps.py

backend/secfit/meals/migrations/0001_initial.py

backend/secfit/meals/migrations/__init__.py

backend/secfit/meals/mixins.py

backend/secfit/meals/models.py

backend/secfit/meals/parsers.py

backend/secfit/meals/permissions.py

backend/secfit/meals/serializers.py

backend/secfit/meals/tests.py

backend/secfit/meals/urls.py

backend/secfit/meals/views.py

backend/secfit/secfit/settings.py

backend/secfit/secfit/urls.py

...end/secfit/workouts/migrations/0004_auto_20211020_0950.py

frontend/www/meal.html

frontend/www/meals.html

frontend/www/scripts/exercise.js

frontend/www/scripts/meal.js