Add example workflow

[mrchrd]

Description

This adds an example/hello-world directory that contains basic documentation, a hardware data file, and a workflow template to run the hello-world workflow.

Why is this needed

It's convenient to have everything needed to run an example workflow in one place, ready to be used, instead of copy-pasting it from official documentation.

How Has This Been Tested?

Ran manually in both vagrant and kind.

How are existing users impacted? What migration steps/scripts do we need?

No impact

Checklist:

I have:

• [ ] updated the documentation and/or roadmap (if required)
• [ ] added unit or e2e tests
• [ ] provided instructions on how to upgrade

[nshalman]

@detiber this looks reasonable to me. Any reason not to merge it? I'm not an expert on this part of the project.

[tstromberg]

Haven't heard any counter-opinions, so I'm merging this.