Update README.md

README.md

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 This repository was created for the purpose of learning how Wasm works.
 Please do not use it in production.
 
+If you want to learn how Wasm runtime works, I recommend this book :)
+
+https://skanehira.github.io/writing-a-wasm-runtime-in-rust/
+
 ## Usage
 ```sh
 $ cat