Courses Upgrade: Add Quizzes and assessments

More features are needed in the courses domain of the platform such as quizzes, etc. So, that people running courses can actually boost engagement on the platform. The quiz question bank should be able to accept Excel sheets bifurcating content with categories and tags. When generating a quiz for any lesson/course we can actually add the instructions like 10 questions, 2 each from the categories A,B,C,D,E for e.g