Create container-as-a-service.md

[DaveVentura]

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Checklist before opening this PR (put x in the checkboxes)

• [ X] This PR does not contain plagiarism
  • don’t copy other people’s work unless you are quoting and contributing it to them.
• [ X] I have signed off on all commits
  • signing off (ex: git commit -s) is to affirm that commits comply DCO. If you are working locally, you could add an alias to your gitconfig by running git config --global alias.ci "commit -s".