To get started, something like this should probably be enough:

pod install

And assuming your App.net username, the channel you're interested in, and your App.net token are in the ADN_USERNAME, ADN_CHANNEL_ID, and ADN_TOKEN environment variables:

defaults write com.mthurman.ADNNotifier username $ADN_USERNAME
security add-generic-password -s ADNNotifier -a $ADN_USERNAME -w $ADN_TOKEN