document how to use the k8s driver

[glyn]

Currently, it's necessary to look in the code to see how to configure the driver.

[glyn]

This issue may interest you @jlegrone.

[jlegrone]

How should this be tackled? Should duffle surface driver config via the CLI?

[glyn]

The aim of this issue is simply to document what's already there so people don't need to read the code in order to use the k8s driver. No functional changes should be needed in duffle.

[technosophos]

Originally I had wanted drivers to be self-documenting, and to integrate with the Duffle CLI help. But, yeah, as @glyn points out... right now it would be nice to just have a markdown page documenting usage.

[jeremyrickard]

@glyn should we move this to cnab-go and have the documentation live there? Or in this repo? Or both?

[glyn]

Probably best to document it in cnab-go and link to it from this repo, and perhaps also the online help, for ease of use.