Add example for Access Points

[2uasimojo]

Adds a README and sample specs for exposing multiple independent data
sources on the same EFS volume by creating and mounting access points.

Is this a bug fix or adding new feature?
Neither, really. It's adding docs for a thing that already works.

What is this PR about? / Why do we need it?
There are questions about how to manage the permissions of the mounts, which by default are inaccessible because they're owned by root:root with 755 permissions. Changing permissions of the root export and creating subdirectories both require manual intervention by a powerful user. This provides an alternative that does not (though it does require the ability to administer EFS itself).

What testing is done?
Well, this is a doc, so it's not tested per se. But I've been using the outlined procedure under OpenShift Dedicated 4.3.

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Hi @2uasimojo. Thanks for your PR.

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[cblecker]

/ok-to-test

[leakingtapan]

Please document the iam permission

[leakingtapan]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 2uasimojo, leakingtapan

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