[Improvement] Interactive Question and Answer Sheet Generation

[Roaster05]

This pull request aims on implementing the issue referred in #12 by implementing the feature of Interactive Quiz and AnswerKey generation.

Implementation:

The implementation is done using the external libraries of pdf-lib.js but i had to include the scripts rather than importing it as a module due to the Content-Security-Policy of the chrome extension , the question_generation.html file is being modified to include an extra text input field for the title along with an extra button for downloading the answer_key associated with the generated quiz; Apart from this the question_generation.js file is being modified to implement the functions createAnswerKey(); and createQuestions();that maps the generated quiz in the form like format using the pdf-lib.js library.

Current Output:

Generated Questions
Indian Culture.pdf

Generated AnswerKey
Indian Culture_answerKey.pdf

Generated ScreenCast

This might be little long due to quiz generation so wait a little till it generates the pdf

Reviewers

@prarabdhshukla
@MiHarsh