README Md feature: Mermaid diagrams

I want to share another [README feature](https://github.com/coderefinery/documentation/blob/main/content/writing-readme-files.md): [Mermaid syntax](https://mermaid.ai/open-source/intro/getting-started.html). 
It can create simple flowcharts using just text.

For example:
```mermaid
graph LR
    A["Prompt"] --> B["Chat"] --> D["Review"]
    A --> C["IDE"] --> D
```

Thank you!