Adding some config tips to the README

README.md

@@ -19,11 +19,40 @@ Roberto Decurnex (nex.development@gmail.com)
 ## Install
 
 If you are using Bundler you can easily add the following line to your Gemfile:
+
     gem 'rack-jsonp-middleware'
 
 Or you can just install it as a ruby gem by running:
+
     $ gem install rack-jsonp-middleware
 
+## Configuration
+
+### Rails 3
+
+In your `config/application.rb` file add:
+
+    require 'rack/jsonp'
+
+And, within the config block:
+
+    config.middleware.use Rack::JSONP
+
+Here is an exelent example of this - [Rails 3 Configuration Example](https://github.com/rwilcox/rack_jsonp_example/commit/809c2e3d4470b694ba1a98c09f2aa07115f433e5 "Rails 3 Configuration Example")
+
+Thank you [rwilcox](https://github.com/rwilcox "rwilcox profile")! 
+
+### Rails 2
+
+Same as for Rails 3 but modifying the `config/environment.rb` file instead.
+
+### Rack Apps
+
+In your `config.ru` file add the following lines:
+
+    require 'rack/jsonp'
+    use Rack::JSONP
+
 ## Download
 
 You can also clone the project with Git by running: