title: Create .csv or .txt with source/copyright infomation in first couple of lines to export from shiny
body: <p>I am creating a shiny app for people to download results of our study. I have set up everything within shiny for users to create their own database and a download button to return a csv of their results. However, I need to include some copyright information at the top of the outputted csv file, ideally like this:</p>
  
  <pre><code>Source: Data from us.
  Copyright: Us.
  
  Age   Sex      Size  
  1     Male     10
  2     Male     4
  [...more rows...]
  100   Female   1 
  </code></pre>
  
  <p>I am struggling to get <code>write.table</code> or <code>write.csv</code> to provide me with this format. They both put the column headers (Age, Sex, Size) at the top of page. Also when I view the csv in Excel the first cell only displays 'Source: D'. I can not seem to get the text to continue over to the next empty cell when I use <code>na=" "</code> in <code>write.csv</code></p>