Adding examples for cloudfront distribution-tenants

[ogiderek]

Reason for this change

CloudFront documentation needs to be updated with code samples for SaaS.

Description of changes

Adding code samples for basic SaaS use cases.

Describe any new or updated permissions being added

None

Description of how you validated changes

Only README.md updates, but I've also validated the code samples in the README in a dev account.

Checklist

• [x ] My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 0f455bc
• Result: FAILED
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