Added migrate resources note to README

[judyheflin]

Added note on steps to migrate resources to the ACK controller if you're coming from the old SageMaker operators for Kubernetes.

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[ack-bot]

Hi @judyheflin. Thanks for your PR.

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[surajkota]

thanks, one minor comment

[surajkota]

nit: the following sample demonstrates how to adopt a SageMaker Endpoint

[surajkota]

/approve
/lgtm

[ack-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: judyheflin, surajkota

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[a-hilaly]

/retest