[Feature Request] Invocation examples

[lonix1]

Please add examples to the help text, per command.

As done for Spectre.Console. (Examples are optional; they are specified in code, they aren't created dynamically.)

e.g. myapp foo --help will also print this:

EXAMPLES:
  myapp foo
  myapp foo -f somefile.txt
  myapp foo --file somefile.txt