Give Ajax IM a proper web framework with Express.js (bug 17)

Start bugs 17, 12, 13

* Begin integration of Express.js grammar into Ajax IM server (bug 17)
* Add basic framework for various chat object (User, Message, Room,
  Notification) (bug 12)
* Begin bringing Ajax IM up to speed with Node.js (assisted by bug 17) (bug 13)

README.md

@@ -1,2 +1,25 @@
-# What is Ajax IM?
-**Ajax IM ("Ajax Instant Messenger") is a browser-centric instant messaging framework.** It uses AJAX to create a real-time (or near real-time) IM environment that can be used in conjunction with existing community and commercial software, or simply as a stand-alone product.
+# Ajax IM
+
+Ajax IM ("Ajax Instant Messenger") is a browser-centric instant messaging framework.
+
+
+## What is Ajax IM?
+
+It uses AJAX to create a real-time (or near real-time) IM environment that can be used in conjunction with existing community and commercial software, or simply as a stand-alone product.
+
+
+## Installation
+
+Install `Node.js`:
+    wget http://nodejs.org/dist/node-v0.1.98.tar.gz
+    tar xzf node-v0.1.98.tar.gz
+    cd node-v0.1.98
+    ./configure
+    make
+    make install
+
+Install Node Package Manager (`npm`):
+    See instructions at [isaacs' npm git repo](http://github.com/isaacs/npm).
+
+Install `Express.js`:
+    npm install express