specification:
- php server storing a server.
- the first person opening a file becomes the master and is in charge to save to the server
- all other users open webrtc connection to the master and keep the document in sync with him
- if it makes things easier, only allow one user at a time to edit a block (paragraph, list, section)
todo:
- check if and how to get webrtc to work without a node server.
- try to convert a chat example in a text editor.