store selected answers and justifications and scores in the backend

[tillmo]

a user that returns to the quiz page should not start from scratch, but from his/her previous state It suffices to store that data once the user presses "submit"

[tillmo]

For a quiz, there are three possible states:

• 0 questions answered: "start"
• all questions answered: "completed"
• otherwise: "continue"

[tillmo]

just some hints:

• in backend/lqserver/QuizBoard/models.py, you need to add a Justification field to class Response.
• the backend code for storing, for user u and quiz q, the response selecting answer a_i and justification j_i for question q_i (i=1..n) is like

  qt = QuizTakers.objects.create(user=u, quiz=q, correct_answers=..., completed=... )
  Response.objects.create(quiztaker=qt,question=q_1,answer=a_1,justification=j_1)
  ...
  Response.objects.create(quiztaker=qt,question=q_n,answer=a_n,justification=j_n)

  Please do not hesitate to ask any questions.

[tillmo]

fixed by #64