title: Password field with optional button to show password with vaadin
body: <p>I need to create a Password field with an optional button to show password with vaadin and to be obligatory (**).
  I try to find out on my own but I didn't find anything I know is a simple thing, but I am new and I don't have much time left for my task. can someone provide me an example, please.</p>
  
  <p><a href="https://i.stack.imgur.com/pKjwP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pKjwP.png" alt="that kind i need"></a></p>