Adding install instructions for Rails 3

Author: mrduncan

README.markdown

@@ -601,7 +601,7 @@ Alternately you can define a `resque:setup` hook in your Rakefile if you
 don't want to load your app every time rake runs.
 
 
-### In a Rails app, as a gem
+### In a Rails 2.x app, as a gem
 
 First install the gem.
 
@@ -632,7 +632,7 @@ Don't forget you can define a `resque:setup` hook in
 `lib/tasks/whatever.rake` that loads the `environment` task every time.
 
 
-### In a Rails app, as a plugin
+### In a Rails 2.x app, as a plugin
 
     $ ./script/plugin install git://github.com/defunkt/resque
 
@@ -647,6 +647,40 @@ Don't forget you can define a `resque:setup` hook in
 `lib/tasks/whatever.rake` that loads the `environment` task every time.
 
 
+### In a Rails 3 app, as a gem
+
+First include it in your Gemfile.
+
+    $ cat Gemfile
+    ...
+    gem 'resque'
+    ...
+
+Next install it with Bundler.
+
+    $ bundle install
+
+Now start your application:
+
+    $ rails server
+
+That's it! You can now create Resque jobs from within your app.
+
+To start a worker, add this to a file in `lib/tasks` (ex:
+`lib/tasks/resque.rake`):
+
+``` ruby
+require 'resque/tasks'
+```
+
+Now:
+
+    $ QUEUE=* rake environment resque:work
+
+Don't forget you can define a `resque:setup` hook in
+`lib/tasks/whatever.rake` that loads the `environment` task every time.
+
+
 Configuration
 -------------