alpha install docs

Author: tj

Readme.md

@@ -18,6 +18,10 @@ app.listen(3000);
 
     $ npm install -g express
 
+ To install the 3.0 alpha:
+ 
+    $ npm install -g [email protected]
+
 ## Quick Start
 
  The quickest way to get started with express is to utilize the executable `express(1)` to generate an application as shown below: