This repository contains a simple CKEditor plugin boilerplate.
Just clone it and start editing your plugin.js file.
You can preview your plugin in samples/index.html.
This plugin has also a basic testing infrastructure set up. All you need is:
npm install
npm run test-server
This will run a Bender.js instance, listening at localhost:1030.
For more information on how to test CKEditor, see CKEditor Testing Environment guide.