title: Add column for percentages
body: <p>I have a df who looks like this:</p>
  <pre><code>    Total  Initial  Follow   Sched   Supp  Any
  0    5525   3663     968      296     65   533
  </code></pre>
  <p>I transpose the df 'cause I have to add a column with the percentages based on column 'Total'
  Now my df looks like this:</p>
  <pre><code>        0      
  Total    5525
  Initial  3663
  Follow   968
  Sched    296
  Supp     65
  Any      533 
  </code></pre>
  <p>So, How can I add this percentage column?
  The expected output looks like this</p>
  <pre><code>        0       Percentage
  Total    5525     100
  Initial  3663     66.3
  Follow   968      17.5
  Sched    296      5.4
  Supp     65       1.2 
  Any      533      9.6
  </code></pre>
  <p>Do you know how can I add this new column?
  I'm working in jupyterlab with pandas and numpy</p>