Add design document for the operator architecture

[alicefr]

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: alicefr

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[openshift-ci]

@alicefr: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/infra-provision-verify	2cb48a4	link	true	/test infra-provision-verify
ci/prow/operator-lifecycle-verify	2cb48a4	link	true	/test operator-lifecycle-verify

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