Generate Mermaid diagram for OpenAPI

[darrelmiller]

e.g.

flowchart LR
 root["/"] --> Pets
 root --> Users["users"]
 Users --> User["{userId}"]
 User --> UserPets["pets"]
 root --> Store[""store]
 Pets --> Pet["{petId}"]
 Pet --> Owner[""owner] 

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or

flowchart LR
 root["/"] -- pets --> Pets
 root -- users --> Users["GET, POST"]
 Users -- "{userId}" --> User["GET,PATCH,DELETE"]
 User -- pets --> UserPets["GET,POST"]
 root -- store --> Store[""store]
 Pets -- "{petId}" --> Pet["GET,PATCH,DELETE"]
 Pet -- owner --> Owner["GET"] 

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