README.md in rack-passbook-0.0.2

- old
+ new
@@ -10,9 +10,15 @@
 
 This project is an example implementation of this web service specification in Rails, and will serve the basis for a more comprehensive Rails generator in the near future.
 
 > If you're just starting out Passbook development, you should definitely check out [this great two-part tutorial](http://www.raywenderlich.com/20734/beginning-passbook-part-1) by [Marin Todorov](http://www.raywenderlich.com/about#marintodorov) ([Part 1](http://www.raywenderlich.com/20734/beginning-passbook-part-1) [Part 2](http://www.raywenderlich.com/20785/beginning-passbook-in-ios-6-part-22)).
 
+## Installation
+
+```
+$ gem install rack-passbook
+```
+
 ## Requirements
 
 - Ruby 1.9
 - PostgreSQL 9.1 running locally ([Postgres.app](http://postgresapp.com) is the easiest way to get a Postgres server running on your Mac)
 