I just found out about GitHub’s support for Mermaid-based diagrams in README files. This might be a nice addition to Elixir:
Include diagrams in your Markdown files with Mermaid
Mermaid is a JavaScript based diagramming and charting tool that takes Markdown-inspired text definitions and creates diagrams dynamically in the browser. Maintained by Knut Sveidqvist, it supports a bunch of different common diagram types for software projects, including flowcharts, UML, Git graphs, user journey diagrams, and even the dreaded Gantt chart.
