Head over to the Spotify Developer Dashboard and create a new project. Note the Client ID and Secret key. Set the callback URL for your project to http://localhost:8888/callback by going to the "Edit Settings" page and entering this URL in the "Redirect URIs" field.
Finally run gamut in the terminal. If this is your first time using it, it should automatically prompt for your Client ID and Secret.
TODO
Remove unused OAuth scopes
Use prettier spinners and prompts
Show color info for each track during processing/adding
Finetune colour matching
Write a proper README
Maybe
Add alternative names for playlists without emojis for Windows
Error handling can be better
Add paging for AddTrackToPlaylist (handles edge case where 100+ tracks have been liked from the same album)