old_contents: from django.contrib import admin
  from vote.models import Question, Answer
  
  admin.site.register(Question)
  admin.site.register(Answer)
  
new_contents: from django.contrib import admin
  from vote.models import Question, Answer, MultiQuestion, UserAnswer
  
  admin.site.register(Question)
  admin.site.register(Answer)
  admin.site.register(MultiQuestion)
  admin.site.register(UserAnswer)
  
subject: ADD - add models to admin