docs(README): Update for node.js installation.

Carey Hinoki · Carey Hinoki · commit bb19957a115c · 2016-01-19T14:16:16.000-08:00
diff --git a/README.md b/README.md
@@ -23,6 +23,8 @@ The overarching goal of this repository is to provide some basic, digestible, le
 
 ## Getting Started
 
+Install [node.js](https://nodejs.org/).
+
 ```sh
 git clone https://github.com/chemoish/react-universal-tutorial.git
 cd react-universal-tutorial
