Update README.md

Added API docs url

README.md

@@ -3,6 +3,9 @@
 # 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.
 
+You can view the API docs here:
+http://godoc.org/github.com/codegangsta/cli
+
 ## Overview
 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.