Add KEP for cloud provider doc maintenance

[d-nishi]

No description provided.

[andrewsykim]

/ok-to-test

[timothysc]

/lgtm

In general, I think a KEP is overkill documentation changes of this kind where the OWNERS are stakeholders in execution.

[andrewsykim]

A lot more to work to be done here but this is a good starting point.

@timothysc noted! We had agreed to use KEPs to standardize doc format across providers since we need to be coordinated for easier consumption from sig-docs. Maybe it is overkill but this is a good way for us to provide guidance to other subprojects (providers) on how to document things. We're happy to consider other approaches here :)!

/approve

[k8s-ci-robot]

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[andrewsykim]

ref: kubernetes/kubernetes#66825