Image SRCSET Formatter

This module allows you to define image style on multiple screen size.
The "srcset" defines a set of images that will allow the browser to choose between.

It will still use the "src" attribute to identify a “default” image source
to be used in browsers that don't support "srcset".

Installation:

1.) Install and enable this module.
2.) Create an image style that you want to be applied on every screen size.
3.) Go to "Manage display" on the image that you want to use srcset.
4.) Set up the formatter to "Image srscet".
5.) Change the settings and add an image style that will be
used per screen size.