Add references to the SASS sample from docs

Author: gunndabad

CHANGELOG.md

@@ -12,6 +12,10 @@ In your `Program.cs` file, add the following line after `var app = builder.Build
 app.UseGovUkFrontend();
 ```
 
+A new mechanism is available to copy assets from the `govuk-frontend` package into your application.
+This is particularly useful for applications that are using SASS and want to reference scss files from the `govuk-frontend` package.
+See [the SASS sample](samples/Samples.Sass) for an example of how to use this.
+
 ### Tag helper changes
 
 #### `<govuk-service-navigation-nav>` tag helper

README.md

@@ -215,6 +215,9 @@ services.AddGovUkFrontend(options =>
 });
 ```
 
+If you're using SASS and want to be able to reference the `govuk-frontend` SASS variables, mixins and functions in your own SASS files,
+see the [SASS sample](samples/Samples.Sass) for an example of how to set up your project.
+
 ## Components
 
 - [Accordion](docs/components/accordion.md)