Plugin Sample Code
The SDK includes sample code for creating server plugins, for demonstrating various aspects of plugin development and for use as a starting point for your own project.
There are no licenses attached to the code and developers are free to decide how to make use of the provided code examples.
You can use one of those templates as a basis for creating your own plugin.
Plugin with Simple UI Template
Use this template for creating a plugin with a single settings UI page which doesn't require any HTML or JS code to be written. More information can be found here: Simple Plugin UI
Simple Plugin Template
This is a minimal bare-bones template for creating any kind of plugin.