Update README.md

Hedgehog-Computing · Aug 28, 2021 · f576f77 · f576f77
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@@ -31,6 +31,10 @@ yarn install
 yarn watch
 ```
 
+## User Manual
+
+Hedgehog Book: [https://hedgehog-book.github.io/](https://hedgehog-book.github.io/)
+
 ## Video Tutorial
 
 ### Youtube