Add information about how to release the gem

README.md

@@ -26,6 +26,15 @@ After checking out the repo, run `bin/setup` to install dependencies. Then, run
 
 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 the created tag, and push the `.gem` file to [rubygems.org](https://rubygems.org).
 
+## Releasing
+
+1. Update the version in `lib/rubocop/open_project/version.rb`
+2. Update the changelog in `CHANGELOG.md`
+3. Run `bundle install` to update `Gemfile.lock`
+4. Run `rake` to check everything is fine and fix any issues
+5. Commit your changes (`git commit -am 'Prepare release X.Y.Z'`)
+6. Run `bundle exec rake release`
+
 ## Contributing
 
 Bug reports and pull requests are welcome on GitHub at https://github.com/opf/rubocop-openproject.