title: how to append/insert an item at the beginning of a series?
body: <p>imaging i have a series looks like this:</p>
  
  <pre><code>Out[64]: 
  2      0
  3      1
  80     1
  83     1
  84     2
  85     2
  </code></pre>
  
  <p>how can i append an item at the very beginning of this series? the native pandas.Series.append function only appends at the end.</p>
  
  <p>thanks a lot</p>