title: Shiny app with password
body: <p>I have a question about running shiny app after username and password are correct. Similar question is <a href="https://stackoverflow.com/questions/28987622/starting-shiny-app-after-password-input">here</a> but I wont to run my whole app.R from <code>runApp(appDir =())</code>Is is possible at all ? I hope this is not the same question as in the link. I finished my app and I want to only add username and password for protection. 
  Thanks!</p>