update README

README

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+[![Build Status](https://secure.travis-ci.org/fatum/state-handler.png)](http://travis-ci.org/fatum/state-handler)
+
+# StateHandler
+
+This is a gem for adding state-based behavior for objects.
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+    gem 'state-handler'
+
+And then execute:
+
+    $ bundle
+
+Or install it yourself as:
+
+    $ gem install state-handler
+
+## Usage
+
+TODO: Write usage instructions here
+
+## Contributing
+
+1. Fork it
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Added some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create new Pull Request
+