Routes:
POST /signup :
for signup using email id and password.
payload: name, email, phone_no, password
message: if successful "successful signup", if not "wrong email and password".
POST /login :
for login using email id and password.
payload: email, password
messag: if successful "logged in", if not "wrong email and password".
GET /google :
for google authentication
POST /send :
for google sending email through nodemailer
payload: name, message, email
message: if successful "successful", if not error message.