title: add modal to woocommerce add to cart button
body: <p>I am building a wordpress site with woocommerce.</p>
  
  <p>I want to add an optional insurance product that pops up when a customer clicks on 'add to cart' for a particular product. The idea is that they have to accept or decline this product before they continue to the checkout. </p>
  
  <p>I have tried using bootstrap modal but I can't get it to trigger using the add to cart button. 
  Modal is working fine as a specific modal button built into the page, so I know it's not a problem with jquery or bootstrap, but I can't figure out how link it to the add to cart button. </p>
  
  <p>Seems like something that should be built-in to woocommerce already but if it is I've missed it. </p>
  
  <p>Any help much appreciated...</p>