title: How to Sum and Transpose Dataframe Series
body: <p>I have a Dataframe that looks like this: </p>
  
  <pre><code>              M                        V            
       2019-07-11  2019-04-13   2019-07-11  2019-04-14
  NI            1           2            4           9
  </code></pre>
  
  <p>I want the output to only sum values for <code>M</code>, and then separately for <code>V</code>, where each is added as a new row to a separate Dataframe, like so:</p>
  
  <pre><code>  | Total
  ----------
  M |   3
  ----------
  V |  13
  ----------
  </code></pre>
  
  <p>So how can I sum <code>M</code> and <code>V</code>separately, and add each as its own row?</p>