Update README.md

Author: rbrtsmith

README.md

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 * 7kb (gzip) with default settings.
 * [View the demo](http://rbrtsmith.com/nebula-css/)
 * `yarn add nebula-css` / [Get started](#get-started)
+* Check out [Nebula-CSS React Starter](https://github.com/rbrtsmith/nebula-css-react-starter) to see how this can be integrated into a ReactJS project.
 
 Super low-level mobile-first Sass framework using the [ITCSS](https://www.youtube.com/watch?v=1OKZOV-iLj4) architecture and the [BEM(IT)](http://csswizardry.com/2015/08/bemit-taking-the-bem-naming-convention-a-step-further/) naming convention.