[skip ci] more instructions for install

Author: shimwell

README.md

@@ -11,7 +11,12 @@ To host locally
 python -m http.server 8000
 ``` -->
 
+Install instructions on Ubuntu 22.04
 ```
+sudo apt-get install curl
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+. "$HOME/.cargo/env"
+rustup target add wasm32-unknown-unknown`
 cargo build --target wasm32-unknown-unknown --release
 cargo install --locked trunk
 trunk serve --open