title: Create a flag URL column based on country name
body: <p>I have a pandas column with country names as the column.</p>
  
  <p>I need the PNG url for the flags of the country as a separate column. A URL for the US will be like the following, </p>
  
  <pre><code>https://upload.wikimedia.org/wikipedia/en/thumb/a/a4/Flag_of_the_United_States.svg/1280px-Flag_of_the_United_States.svg.png
  </code></pre>
  
  <p>How can I achieve the same.</p>
  
  <p>here is my dataframe with the country names.</p>
  
  <pre><code>0                           Afghanistan
  1                               Albania
  2                               Algeria
  3                               Andorra
  4                                Angola
  5                   Antigua and Barbuda
  6                             Argentina
  7                               Armenia
  8                             Australia
  9                               Austria
  10                      Austria-Hungary
  11                           Azerbaijan
  12                              Bahamas
  13                              Bahrain
  14                           Bangladesh
  15                             Barbados
  16                              Belarus
  17                              Belgium
  18                               Belize
  19                                Benin
  20                               Bhutan
  
  .......
  .......
  Name: Entity, dtype: object
  
  </code></pre>