title: Customize dataframe in R
body: <p>Below is the dataframe in R, I currently have.</p>
  <pre><code>A       B   C   D
  gd      3   65  gd
  ggfh    4   tg  dg
  </code></pre>
  <p>Is there a way to get below output (basically adding a row(merged row) above the header
  <a href="https://i.stack.imgur.com/pb9mK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pb9mK.png" alt="enter image description here" /></a></p>