Add PlantUML source and rendered diagrams

[mogul]

Addresses #5

[pburkholder]

These work for me in VSCode. I think including AWS in deployment-change.md is confusing since AWS should be an abstraction layer under cloud.gov. But for getting initial compliance conversations going this will work.

[pburkholder]

Also, unless you've set up vscode to use a local install of the plantUML server, you are exfiltrating all your architecture to an external service. See https://github.com/cloud-gov/cg-diagrams/tree/peterb/jab_diagrams#federalistpages-diagrams for one way to use a local Docker renderer.

[rahearn]

Great starting point, and I love the inline plantuml rendering and workflow. Just updated the README with information about the plantuml server that @pburkholder mentioned.

One question I have that can be answered after merge, what's the purpose of the generic folder? Seems like a starting point for various cloud.gov diagrams, but in that case wouldn't it be better kept in a single central repo, rather than alongside each repo that is using it?