Update README.md

README.md

@@ -25,6 +25,42 @@ For native USB, the crate utilizies [nusb](https://github.com/kevinmehall/nusb),
 
 For WASM, this crate utilizes [web-sys](https://crates.io/crates/web-sys) which gives access to browser API calls, and in this case is used to interact with [WebUSB](https://developer.mozilla.org/en-US/docs/Web/API/WebUSB_API)
 
+## Example
+To learn about how USB communciations work, check out [USB in a NutShell](https://www.beyondlogic.org/usbnutshell/usb1.shtml).
+
+```rust
+use cross_usb::prelude::*;
+use cross_usb::usb::{Recipient, ControlType, ControlIn};
+use cross_usb::device_filter;
+
+// Obtain a device descriptor using a DeviceFilter,
+// in this case with its VendorID and ProductID
+let filters = vec![
+    device_filter!{vendor_id: 0x054c, product_id: 0x00c9}
+];
+let dev_descriptor = cross_usb::get_device(filters).await.expect("Failed to find device");
+
+// Open the device that the descriptor is describing
+let dev = dev_descriptor.open().await.expect("Failed to open device");
+
+// Obtain an interface of the device
+let interface = dev.open_interface(0).await.expect("Failed to open interface");
+
+// Send a Control transfer to the device, obtaining
+// the result and storing it in `result`
+let result = interface.control_in(ControlIn {
+        control_type: ControlType::Vendor,
+        recipient: Recipient::Interface,
+        request: 0x01,
+        value: 0,
+        index: 0,
+        length: 4,
+    })
+    .await
+    .expect("Sending control transfer failed");
+```
+Check out the [documentation](https://docs.rs/cross_usb/latest/) as well!
+
 ## TODO
 
 - [ ] Add choice for native backend between `libusb` wrapper and pure rust `nusb`