Add doc for WMI

[laozc]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
This PR adds the doc for WMI implementation.

Which issue(s) this PR fixes:

NONE

[k8s-ci-robot]

Hi @laozc. Thanks for your PR.

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[laozc]

@mauriciopoppe @andyzhangx
I added this doc for WMI based implementation.
Could you check if there are any further details need to be included in the doc?

[andyzhangx]

/ok-to-test

[andyzhangx]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, laozc

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[mauriciopoppe]

Thank you for spending the time writing docs about how WMI works in CSI Proxy! This is very useful for maintenance moving forward 👍🏼 .

[laozc]

Sure. Let me know what other details are needed for maintenance.