This shows a small example of using a client to connect to the gRPC server.
It shows how a number of important things:
How to connect securely to a server, provided you have access to the server Certificate.
How to parse a gRPC status error message with an error Detail.
How to consume all messages on a server side stream.
Note that running the client twice without restarting the server inbetween
will make it fail the second time, since a user is added to the server in the
first call, and can't be added again.