New feature : add email verification

[Vaishali054]

• The email of patient and doctor should be verified to prevent misuse
• Add backend routes for it
• add frontend for otp (or just sent a link to email for verification)

[Sourabh-awasthy]

OTP verification routes are there for patients by nodemailer . Same can be done for patients and hospitals

[Vaishali054]

yes sure, could you assign this to me :)