README.md in onnxruntime-0.2.0 vs README.md in onnxruntime-0.2.1

@@ -69,5 +69,15 @@
 
 - [Report bugs](https://github.com/ankane/onnxruntime/issues)
 - Fix bugs and [submit pull requests](https://github.com/ankane/onnxruntime/pulls)
 - Write, clarify, or fix documentation
 - Suggest or add new features
+
+To get started with development and testing:
+
+```sh
+git clone https://github.com/ankane/onnxruntime.git
+cd onnxruntime
+bundle install
+bundle exec rake vendor:all
+bundle exec rake test
+```