title: Comparing the contents of 2 excel files
body: <p>I have 2 excel files and i wanted to compare the contents and highlight the differences.
  For example:</p>
  
  <p>first file...</p>
  
  <pre><code>name|age
  abc|123
  def|456
  second file...
  name|age
  abc|123
  def|456
  ghi|789 - this being the differece
  </code></pre>
  
  <p>is there any third party libraries to do this?
  or what would be the best way to do it?</p>