We are talking about carousel included in Bootstrap 4, you can see how to add one here.

Add this to your JS file or load it on the footer

// Thanks to Maaaaark - https://github.com/maaaaark/bcSwipe/blob/master/jquery.bcSwipe.min.js
!function(t){t.fn.bcSwipe=function(e){var n={threshold:50};return e&&t.extend(n,e),this.each(function(){function e(t){1==t.touches.length&&(u=t.touches[0].pageX,c=!0,this.addEventListener("touchmove",o,!1))}function o(e){if(c){var o=e.touches[0].pageX,i=u-o;Math.abs(i)>=n.threshold&&(h(),t(this).carousel(i>0?"next":"prev"))}}function h(){this.removeEventListener("touchmove",o),u=null,c=!1}var u,c=!1;"ontouchstart"in document.documentElement&&this.addEventListener("touchstart",e,!1)}),this}}(jQuery);
 
// Swipe functions for Bootstrap Carousel
$('.carousel').bcSwipe({ threshold: 50 });

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