Add metadata

[RedbackThomson]

Issue #, if available: aws-controllers-k8s/community#1637

Description of changes:
Adds service metadata to the metadata.yaml file

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-bot]

@RedbackThomson: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
acm-recommended-policy-test	7ffd793	link	/test acm-recommended-policy-test
acm-kind-e2e	7ffd793	link	/test acm-kind-e2e
acm-release-test	7ffd793	link	/test acm-release-test

Full PR test history. Your PR dashboard.

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[RedbackThomson]

I will manually merge this PR once it has been approved, since I'm not ready to add a recommended policy or e2e tests, but the documentation needs to be fixed

[ack-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: A-Hilaly, RedbackThomson

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