Add FAQ answer re: relative files with Tailwind

Author: dhh

README.md

@@ -28,6 +28,13 @@ You must already have node and yarn installed on your system. You will also need
 Or, in Rails 7+, you can preconfigure your new application to use a specific bundler with `rails new myapp --css [tailwind|bootstrap|bulma|postcss|sass]`.
 
 
+## FAQ
+
+### How do I import relative CSS files with Tailwind?
+
+If you want to use `@import` statements as part of your Tailwind application.js file, you need to [configure Tailwind to use `postcss` and then `postcss-import`](https://tailwindcss.com/docs/using-with-preprocessors#build-time-imports). But you should also consider simply referring to your other CSS files directly, instead of bundling them all into one big file. It's better for caching, and it's simpler to setup. You can refer to other CSS files by expanding the `stylesheet_link_tag` in `application.html.erb` like so: `<%= stylesheet_link_tag "application", "other", "styles", "data-turbo-track": "reload" %>`.
+
+
 ## License
 
 CSS Bundling for Rails is released under the [MIT License](https://opensource.org/licenses/MIT).