title: Add "Size Guide" button or Icon to product pages
body: <p>I sell shoes and clothes on <a href="http://www.pareshstore.com" rel="nofollow">My Website</a> and I need to add an option for sizing guide. Probably you have seen it on most websites. Below the "add to cart" there is a small icon for "size guide". I need to make a button or icon to be able to show size charts. For example you can see this website :</p>
  
  <p><a href="http://www.zalando.co.uk/nike-sportswear-md-runner-txt-trainers-grey-ni112a02i-c11.html" rel="nofollow">http://www.zalando.co.uk/nike-sportswear-md-runner-txt-trainers-grey-ni112a02i-c11.html</a></p>
  
  <p>I'd be much appreciated if you could help me step by step because I am beginner. </p>
  
  <p>thank you</p>