Add GitHub teams for kui repo

[nikhita]

Ref: #2461

/assign @starpit

[k8s-ci-robot]

@nikhita: GitHub didn't allow me to assign the following users: starpit.

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In response to this:

Ref: #2461

/assign @starpit

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nikhita

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• config/kubernetes-sigs/sig-cli/OWNERS [nikhita]

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[nikhita]

/assign @palnabarun
for lgtm

[palnabarun]

/lgtm