Authentication feature

1. Listen on localhost:5000
2. Authentication form is rendered at http://localhost:5000/
3. User is redirected to the profile page if successfully authenticated
4. Profile page is shown for the authenticated user only at http://localhost:5000/profile
5. User name and password are stored in Redis

How to run the program:

1. Execute pip install -r requirements.txt
2. Start a redis via docker: docker run -p 6379:6379 -it redis/redis-stack:latest
3. Execute python app.py
4. Open http://localhost:5000