Edit in JSFiddle

$(document).ready(function(){
  $('.slider').bxSlider({
  	mode: 'vertical'
  });
});

              
<div class="slider">
  <div><img src="http://via.placeholder.com/775x300" alt=""></div>
  <div><img src="http://via.placeholder.com/775x300" alt=""></div>
  <div><img src="http://via.placeholder.com/775x300" alt=""></div>
</div>