Document label and annotation propagation

[adrianludwin]

Part of #47 . We need docs.

[adrianludwin]

/good-first-issue

[k8s-ci-robot]

@adrianludwin:
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[adrianludwin]

/assign

I have a PR ready to go

[adrianludwin]

Fixed by #165

[adrianludwin]

/close

[k8s-ci-robot]

@adrianludwin: Closing this issue.

In response to this:

/close

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