Plan moving forward

1. Gather all the requirements for the project and organize them in an issue
2. Study what is needed in the backend in order to handle messages from yjs clients (https://github.com/yjs/y-websocket/tree/da27b0bdbfed900daeb4daeb8c1f1253221ac787/bin)
3. Experiment with the flow as presented in the above repo and determine how we should handle multiple documents and not just one
4. Extract potential handlers that could become reusable in order to implement them in coko/server and expose them from there
5. Think about what models should be introduced in this project based on requested functionality (open RFC for discussion)