Adding prerequisite instructions

PREREQUISITES.md

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+### Extreme NodeJS Development
+
+ 1. Install [NodeJS](http://nodejs.org). If you're on a Mac, you can install NodeJS through [Homebrew](http://mxcl.github.com/homebrew/) or Macports. Otherwise, detailed instructions for installing node are at: [https://github.com/joyent/node/wiki/Installation](https://github.com/joyent/node/wiki/Installation).  Please make sure they're on node version 0.6 or higher by running `node -v`.
+ 2. Install [npm](http://npmjs.org) (Only on NodeJS v0.6.2 and lower). [Instructions](https://github.com/isaacs/npm). Make sure you're on version 1.0 or higher by running `npm -v`.
+ 3. Install [MongoDB](http://www.mongodb.org). Get the latest package for your system at: [http://www.mongodb.org/downloads](http://www.mongodb.org/downloads) or through Homebrew.
+ 4. Your favorite editor with JavaScript syntax highlighting.