terminal entry and help should guide/help users

[maxandersen]

Description

entering the terminal as a user you are just shown:

quarkus$

no info, no help command and I only by chance realized tab completion works.

Suggestions:

0. Provide a help command that explains a bit about what you can do.

1. give some initial context:

You are now in Quarkus Terminal. Your app is still running. Use `help` or tab completion to explore.

quarkus$

2. have a help/info for the commands with some examples. Still haven't figured out what the commands do :)

Implementation ideas

No response

[maxandersen]

3. all commands now just return no message/info when run, i.e. "test pattern" has zero output.