Adding Heroku notifier readme

README_FOR_HEROKU_ADDON.md

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+Hoptoad
+===========
+Send your application errors to our hosted service and reclaim your inbox.
+
+1. Installing the Heroku add-on
+----------------------------
+To use Hoptoad on Heroku, install the Hoptoad add-on:
+
+    $ heroku addons:add hoptoad:basic # This adds the the basic plan.
+                                      # If you'd like another plan, specify that instead.
+
+2. Including the Hoptoad notifier in your application
+--------------------------------------------------
+After adding the Hoptoad add-on, you will need to install and configure the Hoptoad notifier.
+
+Your application connects to Hoptoad with an API key. On Heroku, this is automatically provided to your
+application in `ENV['HOPTOAD_API_KEY']`, so installation should be a snap!
+
+### Rails 3.x
+
+Add the hoptoad_notifier gem to your Gemfile.  In Gemfile:
+
+    gem 'hoptoad_notifier'
+
+Then from your project's RAILS_ROOT, run:
+
+    $ bundle install
+    $ script/rails generate hoptoad --heroku
+
+### Rails 2.x
+
+Add the hoptoad_notifier gem to your app. In config/environment.rb:
+
+    config.gem 'hoptoad_notifier'
+
+Then from your project's RAILS_ROOT, run:
+
+    $ rake gems:install
+    $ rake gems:unpack GEM=hoptoad_notifier
+    $ script/generate hoptoad --heroku
+
+As always, if you choose not to vendor the hoptoad_notifier gem, make sure
+every server you deploy to has the gem installed or your application won't start.
+
+### Rack applications
+
+In order to use hoptoad_notifier in a non-Rails rack app, just load the hoptoad_notifier, configure your API key, and use the HoptoadNotifier::Rack middleware:
+
+    require 'rubygems'
+    require 'rack'
+    require 'hoptoad_notifier'
+
+    HoptoadNotifier.configure do |config|
+      config.api_key = `ENV['HOPTOAD_API_KEY']`
+    end
+
+    app = Rack::Builder.app do
+      use HoptoadNotifier::Rack
+      run lambda { |env| raise "Rack down" }
+    end
+
+### Rails 1.x
+
+For Rails 1.x, visit the [Hoptoad notifier's README on GitHub](http://github.com/thoughtbot/hoptoad_notifier),
+and be sure to use `ENV['HOPTOAD_API_KEY']` where your API key is required in configuration code.
+
+3. Configure your notification settings
+-------------------------------------------
+
+Once you have included and configured the notifier in your application,
+you will want to configure your notification settings.
+
+Hoptoad can deliver exception notifications to your email inbox.  To configure these delivery settings:
+
+1. Visit your application's Hoptoad Add-on page, like [ http://api.heroku.com/myapps/my-great-app/addons/hoptoad:basic ](http://api.heroku.com/myapps/my-great-app/addons/hoptoad:basic) 
+2. Click "Go to Hoptoad admin" to configure the Hoptoad Add-on on the Hoptoadapp.com website
+3. Click the "Profile" button in the header to edit your email address and notification settings.