ADD: Alert box or Kind of a warning pop-up for error

[Sakhi29]

On submitting the blank form without selecting any answer to the question, we are being redirected to a page which looks something like this 👇...... So, rather than rendering a new page for error we can just show pop-up message to the user to fill out and answer all the questions or else it won't be submitted.

I would like to work upon this! Waiting for issuance! Happy Contributing :)