fix(docs): Add git to Prerequisites

Add git to prerequisites so that especially Windows users would realise to install it.

Fixes meanjs#1310

README.md

@@ -17,6 +17,7 @@ Before you begin we recommend you read about the basic building blocks that asse
 
 ## Prerequisites
 Make sure you have installed all of the following prerequisites on your development machine:
+* Git - [Download & Install Git](https://git-scm.com/downloads). OSX and Linux machines typically have this already installed.
 * Node.js - [Download & Install Node.js](https://nodejs.org/en/download/) and the npm package manager. If you encounter any problems, you can also use this [GitHub Gist](https://gist.github.com/isaacs/579814) to install Node.js.
   * Node v5 IS NOT SUPPORTED AT THIS TIME! 
 * MongoDB - [Download & Install MongoDB](http://www.mongodb.org/downloads), and make sure it's running on the default port (27017).