Base Url: https://authentication-khaki.vercel.app/
/--------- User registration -------------/
@route POST api/v1/signup @access public
/--------- User Login -------------/
@route POST api/v1/login @access public
/--------- Get all Users -------------/
@route GET api/users @access private
/--------- Get One User by Id -------------/
@route GET api/users/:id @access private