README.md in slackgetter-0.1.0 vs README.md in slackgetter-0.1.1

@@ -20,22 +20,55 @@
 
     $ gem install slackgetter
 
 ## Usage
 
-TODO: Write usage instructions here
+### Setting environment variable
 
+Generate token with [legacy token generator](https://api.slack.com/custom-integrations/legacy-tokens).
+
+Edit `~/.bash_profile` (or `~/.zshrc` if you use Zsh) to set `SLACK_TOKEN` environment variable:
+
+```
+export SLACK_TOKEN=<generated-token>
+```
+
+### Examples to get messages
+
+Getting messages in `general` channel from just one day ago to now:
+
+```
+$ slackgetter time general
+```
+
+Getting messages in `general` channel from `2017-04-01 12:34:56` to now:
+
+```
+$ slackgetter time general `2017-04-01 12:34:56`
+```
+
+Getting messages in `general` channel from `2017-04-01 0:00` to `2017-04-01 9:00`:
+
+```
+$ slackgetter time general 2017-04-01 '2017-04-01 9:00'
+```
+
+Getting messages with URL in `general` channel from `https://t-okuaki.slack.com/archives/XXXXXXXXX/p1492065698851926` to `https://t-okuaki.slack.com/archives/XXXXXXXXX/p1492095485531747`:
+
+```
+$ slackgetter url general https://t-okuaki.slack.com/archives/XXXXXXXXX/p1492065698851926 https://t-okuaki.slack.com/archives/XXXXXXXXX/p1492095485531747
+```
+
 ## 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]/slackgetter. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.
+Bug reports and pull requests are welcome on GitHub at https://github.com/t-okuaki/slackgetter. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.
 
 
 ## License
 
 The gem is available as open source under the terms of the [MIT License](http://opensource.org/licenses/MIT).
-