Added overview figure

[nqn]

Adds architecture overview figure to README

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[nqn]

/assign @ajay191191

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I signed it!

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CLAs look good, thanks!

[nqn]

/retest

[k8s-ci-robot]

@nqn: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
kubeflow-experimental-kvc-presubmit	c8f628ce30f6ebb40d82a7a2e30dab70a04748ed	link	/test kubeflow-experimental-kvc-presubmit

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