Added to README

README.md

Index: README.md
===================================================================
--- a/README.md
+++ b/README.md
@@ -1,8 +1,45 @@
 # Website defaults
 
 Default resources for eyeo websites.
 
+## How to use website-defaults
+
+### In [eyeo/cms](https://gitlab.com/eyeo/websites/cms) websites
+
+All website-default resources can be used as-if they were local resources in any [eyeo/cms](https://gitlab.com/eyeo/websites/cms) generated website by configuring `additional-paths` inside `settings.ini`.
+
+1. Install website-defaults as a dependency
+
+`npm i --save gitlab:eyeo/websites/website-defaults`
+
+2. Add website-defaults dependency to `settings.ini` `additional-paths` list
+
+```
+[paths]
+additional-paths =
+  node_modules/website-defaults
+```
+
+### In any website
+
+One may also choose to include the SCSS resources in `website-defaults/static/scss` into any other website build proceedure.
+
+## Why to use website-defaults
+
+website-defaults provides shared resources for eyeo websites.
+
+Shared resources enable eyeo website developers to develop and maintain one copy of commonly used resources and components instead of several.
+
+Shared resources also enable eyeo website developers to build new websites faster when they use and / or remix previously established UI patterns.
+
+## Why not use another framework / library?
+
+1. Because they overkill eyeo websites
+1. Because we want to avoid specializing
+
+We are not against using another framework / library when it's appropriate.
+
 ## License
 
 - CSS Reset (scss/_reset.scss) based on [Eric Meyer's CSS Reset](http://meyerweb.com/eric/tools/css/reset/): Public Domain
 - Form styles (scss/forms) based on normalize.css: [MIT License](https://github.com/necolas/normalize.css/blob/master/LICENSE.md) by Nicolas Gallagher and Jonathan Neal