I hope you are well today and thank you for your questiond.
is revolution slider included in my purchase?
Yes, it is bundled with the theme and you can install it from Admin Area -> Appearance -> Install Plugins after activating the theme.
is it possible sset up a revolution slider from jevelin foodie demo: https://jevelin.shufflehound.com/foodie/
Yes it is possible and you can create the same page and slider by importing the foodie demo content as described in the below page after activating the theme and slider revolution plugin on your site.