Update README

README.md

@@ -2,3 +2,39 @@ to_boolean
 ==========
 
 Ruby core extension that converts string and integer values to boolean.
+
+Installation
+==========
+
+In your Gemfile:
+
+`gem 'to_boolean'`
+
+Install gem manually:
+
+`$ gem install to_boolean`
+
+Usage
+==========
+
+`'true'.to_boolean #=> true`
+
+`1.to_boolean #=> true`
+
+`'false'.to_boolean #=> false`
+
+`0.to_boolean #=> false`
+
+See more from **spec/spec_to_boolean.rb**.
+
+Run the tests
+==========
+
+`$ bundle`
+
+`$ rake`
+
+License
+==========
+
+MIT