Retrieve User Details via nodejs-auth0 SDK

@gintomm,

I got this to work:

const ManagementClient = require('auth0').ManagementClient;

const auth0 = new ManagementClient({
  domain: 'xxxx.auth0.com',
  clientId: 'xxxx',
  clientSecret:'xxxx',
  scope: 'read:users update:users',
});

const GetUserDetails = async userId => {
  console.log('userId', userId);

  auth0
    .getUser({ id: userId })
    .then(function(users) {
      console.log(users);
    })
    .catch(function(err) {
      console.log(err);
    });
};

const userId = 'auth0|xxxx';

GetUserDetails(userId);