The easiest would probably be using a service like https://www.cookiebot.com/ or https://cookieinformation.com/

If you don't want to use a 3rd party for that feature, you can use the following approach:

1. Create a controller and a child action that will check for a specific cookie for your website
   1. If the cookie is not there, you can display the screen / modal / notification about cookie consent and the buttons to accept / reject the cookies
   2. If the cookie is there, you can enable scripts that are requiring cookie consent.
2. Create a separate action for when the user accepts/rejects cookies that will create the cookie to be used to know the user decision and be used at point 1.2