title: Woocommerce add to cart URL
body: <p>I am trying to work out whether it might be possible to put a straightforward HTML URL link on a button in order to add a product to a woocommerce cart.  I am using a wordpress theme to show digital downloadable products but the theme itself has no cart and checkout facility so I am trying to use woocommerce for this.</p>
  
  <p>I have a button for each of my products which can contain a URL to link directly to the downloadable file but when clicked I want it instead to add the product to the woocommerce cart.</p>
  
  <p>There appears to be a way to do this using a shortcode but the theme is stripping out the square brackets to I need a full URL instead.</p>