feat: update readme

README.md

@@ -1 +1,27 @@
-# This is readme
+# JungoAI Book
+
+This repository contains the source of "JungoAI" book.
+
+## Requirements
+
+Building the book requires [mdBook](https://rust-lang.github.io/mdBook/index.html).
+
+```
+cargo install mdbook
+```
+
+## Building
+
+To build the book:
+
+```
+mdbook build
+```
+
+## Run Locally
+
+To serve web page locally:
+
+```
+mdbook serve
+```