MIDI Mixer provides a template plugin repository on GitHub which can be used to quickly bootstrap a new plugin and get started on the functionality.
GitHub - midi-mixer/plugin-template: A template for a MIDI Mixer plugin.
The MIDI Mixer Template Plugin
The template above guides you through the steps. Once you've cloned and built your plugin with npm install and npm run build:watch, you should be able to refresh your MIDI Mixer plugins list and see your new plugin!
The MIDI Mixer Template Plugin, viewed in the UI
Continue with the following pages to see some information about some of the key files within the template plugin.