title: Including power bi on a microsoft teams custom app
body: <p>I'm building a custom app for ms teams and I would like to include another tab with power bi.
  For example, on the teams chat we can click the '+' to add a new tab and add power bi app.</p>
  <p>Can we include the '+' button on a custom app to do the same or can we include a power bi tab out of the box?</p>
  <p>Tks</p>