run mdbook-mermaid install

Author: nikomatsakis

book.toml

@@ -11,7 +11,11 @@ edition = "2018"
 [output.html]
 site-url = "/wg-async-foundations/"
 git-repository-url = "https://github.com/rust-lang/wg-async-foundations"
+additional-js =["mermaid.min.js", "mermaid-init.js"]
 
 [output.html.fold]
 enable = true
 level = 0
+[preprocessor]
+[preprocessor.mermaid]
+command = "mdbook-mermaid"

mermaid-init.js

@@ -0,0 +1 @@
+mermaid.initialize({startOnLoad:true});

mermaid.min.js

@@ -36,3 +36,11 @@ The async vision document provides a forum where the Async Rust community can pl
 ## 🚧 Under construction! Help needed! 🚧
 
 This document is not yet complete! We are actively working on it as part of the working group, and we would like your help! Check out the [How to vision doc](./vision/how_to_vision.md) page for more details.
+
+```mermaid
+graph TD;
+A-->B;
+A-->C;
+B-->D;
+C-->D;
+```