Implement Command Help

[maennchen]

Output help if called with --help or invalid args. If invalid args, exit status should not be 0.

bombom/src/bombom.erl

Line 18 in 0de0dd6

rebar3:run(BaseState, ["sbom"| Args]),

Basically if --help is provided, call rebar3:run(BaseState, ["help", "sbom"]),