Class diagrams generator

[hailstorm75]

Azure and GitLab natively support mermaid; however, GitHub doesn't.

Thus, there must be a separate solution for it utilizing the trick provided by this repo: https://github.com/jonashackt/plantuml-markdown

This part is simple, yet effective :) Simply use the PlantUML proxy http://www.plantuml.com/plantuml/proxy to render your *.iuml files and embed them like images:

![your-UML-diagram-name](http://www.plantuml.com/plantuml/proxy?cache=no&src=https://raw.githubusercontent.com/jonashackt/plantuml-markdown/master/example-uml.iuml)

Use the RAW version of your *.iuml files like that: https://raw.githubusercontent.com/jonashackt/plantuml-markdown/master/example-uml.iuml and prefix it with src=.

Also, you should use the cache=no option so that GitHub always renders the currently committed version of your PlantUML *.iuml files.

[hailstorm75]

It will be solved by #192