Update README.md

Installation

README.md

@@ -1,5 +1,15 @@
-#cli.go
+# cli.go
 cli.go is simple, fast, and fun package for building command line apps in Go. The goal is to enable developers to write fast and distributable command line applications in an expressive way.
 
 ## Overview
-Command line apps are usually so tiny that there is absolutely no reason why your code should *not* be self-documenting.
+Command line apps are usually so tiny that there is absolutely no reason why your code should *not* be self-documenting. Things like generating help text and parsing command flags/options should not hinder productivity when writing a command line app.
+
+This is where cli.go comes into play. cli.go makes command line programming fun, organized, and expressive!
+
+## Installation
+Make sure you have the a working Go environment. [See the install instructions](http://golang.org/doc/install.html).
+
+To install cli.go, simply run:
+```
+go get github.com/codegangsta/cli
+```