Language request: Mermaid

[spenserblack]

Docs

https://mermaid.js.org

Example

```mermaid
---
title: My Diagram
---
erDiagram
    %% This is a comment
    Language {
        string name pk
        string[] extensions
    }
    Tokei ||--|{ Language : supports
    User }|--|{ Language : "writes in"
```

---
title: My Diagram
---
erDiagram
    %% This is a comment
    Language {
        string name pk
        string[] extensions
    }
    Tokei ||--|{ Language : supports
    User }|--|{ Language : "writes in"

Info

• The extensions are .mmd and .mermaid.
• Comments start with %%, although, as you can see in the example, Mermaid can have YAML front-matter, which could have comments that start with #.
• The language can, and often is, embedded in Markdown (see this issue, too 😉)