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

@@ -1,32 +1,50 @@
 # Kaesen (beta version)
 
 A module of the united wrapper for exchanging Japanese yen and Bitcoin and collecting market information of any exchange markets that provide ordinary customers with API access.
 
+日本国内のビットコインの取引所の API を統一された API で操作できる統合 API ラッパーです．
+
 ## Installation
 
 For each of your applications, add the following line to the application's Gemfile:
 
 ```ruby
-gem 'kaesen', github: "him0/kaesen"
+gem 'kaesen'
 ```
 
 Then, run bundler:
 
     $ bundle install
 
+or
+
+```shell
+gem install kaesen
+```
+
 ## Usage
 
 ```
 require 'kaesen'
 b =  Kaesen::Bitflyer.new do |config|
   config.api_key = "XXX"
   config.api_secret = "YYY"
 end
 b.ticker
+b.buy(100000, 0.1) # Buy the 0.1 BTC at the rate is 100,000 BTC/JPY
 ```
 
+or
+
+setting the enviromnet values base on `.env.sample`, and
+
+```
+require 'kaesen'
+b =  Kaesen::Bitflyer.new
+```
+
 ### Currently supported exchange markets to trade:
 
 + bitFlyer
 + BtcBox
 + coincheck
@@ -50,5 +68,9 @@
 
 
 ## License
 
 The gem is available as open source under the terms of the [MIT License](http://opensource.org/licenses/MIT).
+
+## Donation
+
+bitcoin:1B1uB4Z4GoxejicoVs9c61S3jXx7BoHYDq