Tutorials for plugin development

I want to write a simple tuning plugin. It would involve changing the tuning value of each note in the selection based on its letter, its accidental, and data from a separate text file. Each text file in the directory would be a different option in the [Plugins -> Plugin Name] dropdown thing.

Is there a good resource for learning how to make a musescore plugin? The handbook talks about what plugins do and how to use them, but not much on how to program one.

Thanks!