title: How to get the longitude and latitude coordinates from a city name and country in R?
body: <p>I have a long list of city names and countries and I would like to plot them on a map. In order to do this I need the longitude and latitude information of each of the cities. </p>
  
  <p>My table is called <code>test</code> and has the following structure:</p>
  
  <pre><code>Cityname  CountryCode
  New York  US
  Hamburg   DE
  Amsterdam NL
  </code></pre>