UML diagrams for cuda-quantum impl design

[stevescia]

Wanted feedback on documenting the cuda-quantum obect model with UML drawings; may be useful to people learning the impl details of cuda-quantum. I often draw uml diagrams as a way to learn an object model (the exercise of actual drawing the diagrams helps sink the details in, as well as serving as a reference point later); Started doing this for xacc, but now switched to cuda-quantum.

ofc generating these from code would be ideal.

here's a screen shot of an initial plant uml class diagram for qudit and qreg. comments on the diagrams, content, style welcome

[sachingodishela]

Nice. We can have these diagrams in README files in relevant folders. Checkout mermaid, which is supported by GitHub in markdown files. See examples here.