Feature request: Improve help text for deadline bundle submit --help

[ddneilson]

Use Case

Imagine a customer is trying to figure out how to provide values for their Job Parameter(s) when using the command deadline bundle submit. They type deadline bundle submit --help and see:

Options:
  -p, --parameter TEXT            Job template parameters

What is the format of "TEXT"?? (turns out that it's -p VarName=VarValue, but there's no way to know that)

Proposed Solution

Improve the help text, and the README for the package. For inspiration, please see the run command in https://github.com/OpenJobDescription/openjd-cli. e.g.

% openjd run --help
...
  --job-param KEY=VALUE, file://PATH_TO_PARAMS, '{"KEY": "VALUE", ... }', -p KEY=VALUE, file://PATH_TO_PARAMS, '{"KEY": "VALUE", ... }'
                        Use these Job parameters with the provided template. Can be provided as key-value pairs, path(s) to a JSON or YAML document prefixed with
                        'file://', or inline JSON. If this option is provided more than once then the given values are all combined in the order that they appear.