README: Note where to post feedback

Fix compile time error

Fix Room hosting

 - Use the correct RPC handler for when the 'host-room' command is used.
 - Avoid making clients hang up by returning OK when the rpc endpoint
   call is unknown.

Remove 'connect' argument

Only support useful subcommands to avoid confusing users.  Keep the
Connect code there for future use.

Make slightly less verbose

Remove not needed printing to stdout and replace 'print's with putStrLn
to avoid surrounding output with quotation marks.

initial commit