update readme

Author: sdmg15

examples/example_wallet_hwi_signer/README.md

@@ -5,8 +5,23 @@
 
 sudo apt install libudev-dev
 
-
 ## Build and run
 
 `$ cargo run `
 
+## Running with simulator
+
+Download a simulator at `https://github.com/BitBoxSwiss/bitbox02-firmware/releases/`.
+
+Run the simulator and then run the example with `--features=simulator` enabled.
+
+```sh
+
+curl https://github.com/BitBoxSwiss/bitbox02-firmware/releases/download/firmware%2Fv9.19.0/bitbox02-multi-v9.19.0-simulator1.0.0-linux-amd64
+
+./bitbox02-multi-v9.19.0-simulator1.0.0-linux-amd64
+
+cargo run --features=simulator
+```
+
+