ENH: Document dotfiles to allow synchronization

[corneliusroemer]

One may want to synchronize saved meeting URLs between devices.

To this end, one needs to know where the saved meetings are saved.

I found that they are saved at ~/.zoom-cli/meetings.json but this isn't documented in the README.

It may be good to mention this.

This could also be used to share between teams. The format looks like this:

{
  "MEETINGNAME": { "url": "https://zoom.us/j/12341231?pwd=123123123123"},
  "OTHERMEETINGNAME": { "url": "https://zoom.us/j/12341231?pwd=123123123123"},
  ...
}