Add Email and User ID to the claims in JWT token

[mishtuu]

Please find the line where this change needs to be reflected

https://github.com/incogni23/NotificationSystem/blob/main/createJWT/create.go#L12

We want to add two things here:

• User email (key: "email")
• User id (key: "user_id")

[incogni23]

done and pushed