Create an endpoint to resend OTP

[cjchirag7]

• After signing up, it may be possible that due to some issues, user has not received the OTP.
• So, the user can be resent that OTP using this endpoint, if the user is not verified and the OTP has not expired yet. Otherwise, he should get an error message:
  OTP Expired. Try signing up again."
  (This should work because our OTP is valid for 24 hours)