README.md in ngt-0.1.1 vs README.md in ngt-0.2.0

@@ -4,22 +4,18 @@
 
 [![Build Status](https://travis-ci.org/ankane/ngt.svg?branch=master)](https://travis-ci.org/ankane/ngt)
 
 ## Installation
 
-First, [install NGT](https://github.com/yahoojapan/NGT/blob/master/README.md#Installation). For Homebrew, use:
-
-```sh
-brew install ngt
-```
-
 Add this line to your application’s Gemfile:
 
 ```ruby
 gem 'ngt'
 ```
 
+**Note:** NGT is not available for Windows yet
+
 ## Getting Started
 
 Prep your data
 
 ```ruby
@@ -82,10 +78,17 @@
 
 ```ruby
 index.build_index
 ```
 
+Optimize the index
+
+```ruby
+optimizer = Ngt::Optimizer.new(outgoing: 10, incoming: 120)
+optimizer.execute(path, new_path)
+```
+
 ## Full Example
 
 ```ruby
 dim = 10
 objects = []
@@ -138,5 +141,15 @@
 
 - [Report bugs](https://github.com/ankane/ngt/issues)
 - Fix bugs and [submit pull requests](https://github.com/ankane/ngt/pulls)
 - Write, clarify, or fix documentation
 - Suggest or add new features
+
+To get started with development:
+
+```sh
+git clone https://github.com/ankane/ngt.git
+cd ngt
+bundle install
+bundle exec rake vendor:all
+bundle exec rake test
+```