docs: add design diagram

[suchapalaver]

This is a rendering in PUML of a design diagram drawn up by @gusinacio that Semiotic teammates can see here.

The PUML can generate SVC format diagrams that can be viewed nicely in GitHub.

The idea is that we can collaborate further on this.

Signed-off-by: Joseph Livesey [email protected]

[coveralls]

Pull Request Test Coverage Report for Build 9184510884

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 68.814%

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Totals
Change from base Build 9178939273:	0.0%
Covered Lines:	3760
Relevant Lines:	5464

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💛 - Coveralls

[aasseman]

LGTM, could you generate a larger / nicer looking SVG though? Also perhaps you can add the command you used to generate the SVG, maybe as a comment in the puml file?

[suchapalaver]

LGTM, could you generate a larger / nicer looking SVG though? Also perhaps you can add the command you used to generate the SVG, maybe as a comment in the puml file?

I believe the preview of the file on GitHub renders the SVG at a fixed size. I've embedded the SVG file in the README now to see if that looks satisfactory.