Add a feature document

[jcantrill]

Description

This PR:

• Adds the beginning of a feature document for the release

cc @alanconway @libander

[openshift-ci]

@jcantrill: 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/e2e-ocp-previous	1c44f14	link	false	/test e2e-ocp-previous
ci/prow/e2e-ocp-next	1c44f14	link	false	/test e2e-ocp-next

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[alanconway]

/lgtm
I like the format, it's a great summary.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alanconway, jcantrill

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[jcantrill]

/cherrypick master

[openshift-cherrypick-robot]

@jcantrill: new pull request created: #1808

In response to this:

/cherrypick master

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