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

@@ -1,11 +1,9 @@
 # GoogleSpreadsheetFetcher
 
-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/google_spreadsheet_fetcher`. To experiment with that code, run `bin/console` for an interactive prompt.
+Use OAuth 2 authentication to retrieve data from Google Spreadsheet.
 
-TODO: Delete this and the text above, and describe your gem
-
 ## Installation
 
 Add this line to your application's Gemfile:
 
 ```ruby
@@ -20,17 +18,36 @@
 
     $ gem install google_spreadsheet_fetcher
 
 ## Usage
 
-TODO: Write usage instructions here
+- Make project. https://cloud.google.com/resource-manager/docs/creating-managing-projects
+- Enable Google Drive API
+- Make OAuth 2.0 Client. (other)
+- Download client secret json
 
+```ruby
+credential_store_file = Rails.root.join('config', 'credential-oauth2-supporter.json').to_s
+sheet_key = 'YOUR_SHEET_KEY'
+
+GoogleSpreadsheetFetcher.configure do |config|
+  config.client_secrets_file_path = Rails.root.join('config', 'client_secrets_pokota_supporter.json').to_s
+end
+
+user_id = 'sample'
+fetcher = GoogleSpreadsheetFetcher::Fetcher.new(credential_store_file, user_id, sheet_key)
+
+fetcher.fetch_by_index(0)
+fetcher.fetch_by_title('title')
+fetcher.fetch_by_gid('gid')
+```
+
 ## 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.
 
 To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).
 
 ## Contributing
 
-Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/google_spreadsheet_fetcher.
+Bug reports and pull requests are welcome on GitHub at https://github.com/taka0125/google_spreadsheet_fetcher.