update README

README.adoc

@@ -195,6 +195,19 @@ jupyter notebook
 | link:./chapter-8/chapter-8.ipynb[image:https://img.shields.io/badge/launch-Github-181717.svg?logo=github&logoColor=white[GitHub, width=250]]
 | link:https://mybinder.org/v2/gh/wiseaidev/rust-lang-book/main?filepath=chapter-8/chapter-8.ipynb[image:https://mybinder.org/badge_logo.svg[Launch on Binder, width=250]]
 
+| 9
+| Working with Devices I/O
+| TODO
+|
+▪ Reading from and writing to files in Rust.
+
+▪ Performing common filesystem operations.
+
+▪ Overview of working with hardware devices through Rust interfaces.
+
+| link:./chapter-9/chapter-9.ipynb[image:https://img.shields.io/badge/launch-Github-181717.svg?logo=github&logoColor=white[GitHub, width=250]]
+| link:https://mybinder.org/v2/gh/wiseaidev/rust-lang-book/main?filepath=chapter-9/chapter-9.ipynb[image:https://mybinder.org/badge_logo.svg[Launch on Binder, width=250]]
+
 |===
 
 === Contributing