Clone the repository in to your .drush folder and run composer install.
mkdir ~/.drush
git clone https://github.com/webflo/drush_ddoto.git ~/.drush/drush_ddoto
cd ~/.drush/drush_ddoto
composer install
Copy settings.example.php from vendor/klausi/github_drupalorg and provide the configuration settings.
cp vendor/klausi/github_drupalorg/settings.example.php settings.php
vim settings.php
Upload the files your-patch.patch and your-interdiff.txt to drupal.org/node/123123
drush pp #123123 your-patch.patch your-interdiff.txt