Steps to start the server

just download the repo
move to repo directory and type node app.js in terminal
server starts at process port
Now as user fills in contact form 

Nodemailer

As user fills contact form nodemailer handles the form.
In auth field fill in your google email and password.
In mailOptions field fill in your email in "from field" and in "recipient" field fill in other users email.
Now check the inox you got the email with user's contact form data.