title: add text to pandas dataframe plot
body: <p>I am plotting a dataFrame and I want to add information about the information (mean and std of the data)
  I am plotting the data this way:</p>
  
  <pre><code>df = pd.DataFrame({'type': lifeExpExcel['Country'], 'Infant mort. rate':
  lifeExpExcel['Infant mort. rate']})
  ax = df.plot(kind='bar',x= lifeExpExcel['Country'])
  ax.set_ylabel('Infant mort. rate')
  ax.set_xlabel('Country')
  plt.show()
  </code></pre>
  
  <p>I want to add two string (val + name) to the plot
  How can I do this?</p>
  
  <p>btw if there's a better way to do the plot i'll like to know that</p>