Add installation

Author: danielstjules

README.md

@@ -4,6 +4,14 @@ Run async mocha specs in parallel.
 
 [![Build Status](https://travis-ci.org/danielstjules/mocha.parallel.svg?branch=master)](https://travis-ci.org/danielstjules/mocha.parallel)
 
+## Installation
+
+```
+npm install --save mocha.parallel
+```
+
+## Overview
+
 ```
 /** javascript
  * Builds the test suite dynamically to allow for parallel execution of the