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

@@ -1,6 +1,7 @@
-# LlPay
+LlPay [![Gem Version][version-badge]][rubygems] [![Build Status][travis-badge]][travis] [![Code Climate][codeclimate-badge]][codeclimate] [![Code Coverage][codecoverage-badge]][codecoverage]
+=======
 
 Welcome to your new gem! In this directory, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file `lib/ll_pay`. To experiment with that code, run `bin/console` for an interactive prompt.
 
 TODO: Delete this and the text above, and describe your gem
 
@@ -20,10 +21,19 @@
 
     $ gem install ll_pay
 
 ## Usage
 
-TODO: Write usage instructions here
+### Config
+
+Create `config/initializers/ll_pay.rb` and put following configurations into it.
+
+```ruby
+
+LlPay.oid_partner = "oid_partner"  ＃ lianlian pay 商户编号
+LlPay.rsa_pri_key = "rsa_pri_key"  #  商户RSA密钥
+LlPay.md5_key = "md5_key"          ＃ 商户 MD5
+```
 
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.