Add general usage to readme

Links to instructions on how to include Origami components. Financial-Times/origami#59

README.md

@@ -2,13 +2,18 @@
 
 A component to manage colours. Includes the FT colour palette.
 
+- [Usage](#usage)
 - [Markup](#markup)
 - [CSS Custom Properties](#css-custom-properties)
 - [Sass](#sass)
 - [Migration](#migration)
 - [Contact](#contact)
 - [Licence](#licence)
 
+## Usage
+
+Check out [how to include Origami components in your project](https://origami.ft.com/docs/components/#including-origami-components-in-your-project) to get started with `o-colors`.
+
 ## Markup
 
 ### Colour Usecase Classes