finish installation and prepare some docs

README.org

@@ -4,5 +4,36 @@
 #+startup: indent
 
 #+link: ch01 https://rust-book.cs.brown.edu/ch01-00-getting-started.html
-* Chapter 01
-Let's start
+* Chapter 01: Installation
+Recommendation is to use ~rustup~ using the command:
+#+name: install rustup
+#+begin_src shell
+  curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSf | sh
+#+end_src
+
+To confirm it's installed:
+#+name: confirm rustup installed
+#+begin_src shell
+  rustup --version
+#+end_src
+
+#+RESULTS: confirm rustup installed
+: rustup 1.26.0 (5af9b9484 2023-04-05)
+** Update
+To update ~rustup~ and please do regularly
+#+name: update rustup
+#+begin_src shell :results output
+  rustup update
+#+end_src
+
+#+RESULTS: update rustup
+: 
+:   stable-x86_64-unknown-linux-gnu unchanged - rustc 1.76.0 (07dca489a 2024-02-04)
+: 
+** Documentation
+~rustup~ comes with documentation, just type
+#+begin_src shell
+  rustup doc
+#+end_src
+
+and the browser will open a page with links toward lots of docs.