show open host and port for incoming in beet.

**Is your feature request related to a problem? Please describe.**
First time users like me will not know what is the host and port(ws://localhost:60555) beet is opening for incoming connections from a website.

**Describe the solution you'd like**
We should mention this default host in the README and if possible show somewhere in the application. Console message at least will be good.

**Describe alternatives you've considered**
I got the port beet was opening by using netstat but that is time consuming.

Start with the README and locate the application entry point where beet opens ws://localhost:60555 for incoming website connections. Done means documenting the default host and port and showing them in the application, at least through a console message.

Written by the indexing model from the issue text.