update readme (#7)

Author: KazuCocoa

README.md

@@ -2,69 +2,93 @@
 
 [![Gem Version](https://badge.fury.io/rb/appium_lib_core.svg)](https://badge.fury.io/rb/appium_lib_core)
 
+
+[![Build Status](https://travis-ci.org/appium/ruby_lib_core.svg?branch=master)](https://travis-ci.org/appium/ruby_lib_core)
+
 # Documentation
 
 - http://www.rubydoc.info/github/appium/ruby_lib_core
 
-# Used main library
+# Related library
 - https://github.com/appium/ruby_lib
 
 # How to start
-## Start Appium server
-
-```bash
-$ npm install -g appium
-$ appium
-```
-
 ## Run tests
 ### Unit Tests
+Run unit tests which check each method and commands, URL, using the webmock.
 
 ```bash
 $ bundle install
 $ rake test:unit
 ```
 
 ### Functional Tests
+Run functional tests which require the Appium server and real device, Simulator/Emulator.
 
-```bash
+- Start Appium server
+ ```bash
+$ npm install -g appium
+$ appium
+```
+
+- Conduct tests
+ ```bash
 $ bundle install
 $ rake test:func:android # Andorid 
 $ rake test:func:ios     # iOS
 ```
 
-# How to use this core library
-1. Launch the appium server locally.
+## Run a test case
+1. Launch the Appium server locally.
 2. Run the following script.
 
-```ruby
+- `test.rb`
+ ```ruby
 require 'rubygems'
 require 'appium_lib_core'
 
 opts = {
-       caps: {
-         platformName: :ios,
-         platformVersion: '11.0',
-         deviceName: 'iPhone Simulator',
-         automationName: 'XCUITest',
-         app: '/path/to/MyiOS.app'
-       },
-       appium_lib: {
-       }
-     }
+  caps: {
+    platformName: :ios,
+    platformVersion: '11.0',
+    deviceName: 'iPhone Simulator',
+    automationName: 'XCUITest',
+    app: '/path/to/MyiOS.app'
+  },
+  appium_lib: {
+    wait: 30
+  }
+}
 @core = Appium::Core.for(self, opts) # create a core driver with `opts` and extend methods into `self`
 @driver = @core.start_driver
 
 # Launch iPhone Simulator and `MyiOS.app`
 @driver.find_element(:accessibility_id, 'some accessibility') # find an element
 ```
 
+- Run the script
+```bash
+# shell 1
+$ appium
+
+# shell 2
+$ ruby test.rb
+```
+
 # Release
+Use [appium_thor](https://github.com/appium/appium_thor) to release this gem.
 
 ```bash
 $ bundle exec thor bump # bumpy, bumpz
 $ bundle exec thor release
 ```
 
+# Contribution
+1. Fork it ( https://github.com/appium/ruby_lib_core/fork )
+2. Create your feature branch (git checkout -b my-new-feature)
+3. Commit your changes (git commit -am 'Add some feature')
+4. Push to the branch (git push origin my-new-feature)
+5. Create new Pull Request
+
 # License
 Apache License v2