https://github.blog/2022-02-14-include-diagrams-markdown-files-mermaid/?WT.mc_id=twc9-c9-chwarren
http://mermaid-js.github.io/mermaid/#/
graph TD;
A-->B;
A-->C;
B-->D;
C-->D;
sequenceDiagram
participant Alice
participant Bob
Alice->>John: Hello John, how are you?
loop Healthcheck
John->>John: Fight against hypochondria
end
Note right of John: Rational thoughts <br/>prevail!
John-->>Alice: Great!
John->>Bob: How about you?
Bob-->>John: Jolly good!