Adding plugin to Modified Prosemirror Editor

This is an opensource project variation from Prosemirror editor (React/Nodejs/ES6) [login to view URL] It already uses websocket to communicate with the collab server. However, I wish to add the shared cursor feature into the editor. [login to view URL] This is a YJS project for shared cursor, I hope to combine just the minimal parts of the shared cursor plugin into the existing editor.