fix readme text

.env.example

@@ -2,8 +2,8 @@
 
 # SET YOUR ENV HERE.
 
-export GOOGLE_KEY="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com"
-export GOOGLE_SECRET="xxxxxxxxxxxxxxxxxxxxxxxx"
+export GOOGLE_CLIENT_ID="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com"
+export GOOGLE_CLIENT_SECRET="xxxxxxxxxxxxxxxxxxxxxxxx"
 export DB_TEST_USER="user"
 export DB_TEST_PASS="pass"
 export DB_DEVELOPMENT_USER="user"

README.md

 rendezvous
-==========
 
-A simple markdown-based wiki system for term.
+==========
 
-## Badge
 [![Build Status](https://travis-ci.org/tadyjp/rendezvous.png)](https://travis-ci.org/tadyjp/rendezvous)
 [![Coverage Status](https://coveralls.io/repos/tadyjp/rendezvous/badge.png)](https://coveralls.io/r/tadyjp/rendezvous)
 [![Code Climate](https://codeclimate.com/github/tadyjp/rendezvous.png)](https://codeclimate.com/github/tadyjp/rendezvous)
 [![Dependency Status](https://gemnasium.com/tadyjp/rendezvous.png)](https://gemnasium.com/tadyjp/rendezvous)
 
+A simple markdown-based wiki system for team.
+
+
+# Supported versions
+
+- Ruby 2.0.0+
+- Rails 4.0.0+
+
 # How to install and use.
 
 Get code and install gems.
@@ -19,25 +25,42 @@ $ cd rendezvous
 $ bundle install
 ```
 
-Create YOUR .ENV file.
+Get Google API Key.
+
+Register application on https://code.google.com/apis/console,
+and get
+
+1. Access https://code.google.com/apis/console
+2. Create New Project
+3. Create Client ID ([APIs & auth] > [Credentials] > [CREATE NEW CLIENT ID])
+4. Enter
+  - `http://localhost:3000` in [Authorized Javascript origins]
+  - `http://localhost:3000/users/auth/google_oauth2/callback` in [Authorized redirect URI]
+  and save
+5. Get [Client ID] and [Client secret]
+
+
+Create your .env file.
 
 ```
 $ cp .env.example .env
 $ vim .env
 ```
 
+Set Google API [Client ID] and [Client secret] in `.env`
+
 Setup DB (Default: mysql).
 
 ```
-$ bundle exec rake db:migrate
-$ bundle exec rake db:seed
+$ (bundle exec) rake db:migrate
+$ (bundle exec) rake db:seed
 ```
 
 Set ENV before start server.
 
 ```
 $ source .env
-$ bundle exec rails s
+$ (bundle exec) rails s
 ```
 
 And have fun with your team !

config/initializers/omniauth.rb

 Rails.application.config.middleware.use OmniAuth::Builder do
 
-  provider :google_oauth2, ENV['GOOGLE_KEY'], ENV['GOOGLE_SECRET'],
+  provider :google_oauth2, ENV['GOOGLE_CLIENT_ID'], ENV['GOOGLE_CLIENT_SECRET'],
            name: 'google_oauth2',
            scope: 'https://mail.google.com/, userinfo.email, userinfo.profile',
            access_type: 'offline',