README.md in wso2_toolbox-0.1.0 vs README.md in wso2_toolbox-0.2.0

@@ -20,9 +20,22 @@
 
     $ gem install wso2_toolbox
 
 ## Usage
 
+Firstly, need set credentials to generate token. Create `config/initializers/wso2_toolbox.rb` file and
+fill in the attributes:
+```
+Wso2Toolbox.configure do |config|
+  config.token_url = ENV['GENERATE_TOKEN_DEV_URL']
+  config.token_username = ENV['GENERATE_TOKEN_DEV_USERNAME']
+  config.token_password = ENV['GENERATE_TOKEN_DEV_PASSWORD']
+end
+
+Then, you can generate a token calling `Wso2Toolbox::TokenManager.generate_token`,
+that it will set the new token in your request.
+
+```
 ### Example controller
 
 ```
 class MyController
   include Wso2Toolbox::IdentityHeaders