Added code to create an executable/app, added some info in the readme.

readme.md

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+# Bio-Impedance Amplifier | GUI
+This repository contains Rust-based software for communicating with a custom-built bio-impedance amplifier. It provides several key features:
+
+- Single-frequency and frequency-sweep measurements
+- Real-time visualization of magnitude and phase
+- Support for both 2-lead and 4-lead measurements
+- Data logging to `.csv` files
+- Day and night display modes
+- Control via on-screen buttons or keyboard shortcuts
+
+## How to Use This Software
+1. Install the Rust toolchain and run the software using:
+   ```bash
+   cargo run --bin main_gui --release
+   ```
+2. Alternatively, a precompiled executable can be used instead of building from source.
+3. The software uses the `postcard-rpc` crate to communicate directly with the USB hardware device’s endpoints. After connecting the hardware via USB, the device should automatically connect, and the indicator dot in the top-right corner will turn green.
+4. Check the **Shortcuts** tab for useful information on available keyboard commands.