title: How to add a check box in a PDF file using iText 7?
body: <p>How can I add a checkobox into a Pdf file like it is done in <a href="https://stackoverflow.com/questions/34439850/itextsharp-5-5-6-enters-a-cross-symbol-when-check-type-style-is-check-mark">this</a> question, but using iText 7?</p>
  
  <p>I want the result to look like this:</p>
  
  <p><a href="https://i.stack.imgur.com/H8Lil.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/H8Lil.png" alt="expected result"></a></p>