Add link to embassy

Also mention that LEDs need series resistors.

src/main.rs

@@ -55,9 +55,13 @@ fn main() -> ! {
 
     // This is the correct pin on the Raspberry Pico board. On other boards, even if they have an
     // on-board LED, it might need to be changed.
-    // Notably, on the Pico W, the LED is not connected to any of the RP2040 GPIOs but to the cyw43 module instead. If you have
-    // a Pico W and want to toggle a LED with a simple GPIO output pin, you can connect an external
-    // LED to one of the GPIO pins, and reference that pin here.
+    //
+    // Notably, on the Pico W, the LED is not connected to any of the RP2040 GPIOs but to the cyw43 module instead.
+    // One way to do that is by using [embassy](https://github.com/embassy-rs/embassy/blob/main/examples/rp/src/bin/wifi_blinky.rs)
+    //
+    // If you have a Pico W and want to toggle a LED with a simple GPIO output pin, you can connect an external
+    // LED to one of the GPIO pins, and reference that pin here. Don't forget adding an appropriate resistor
+    // in series with the LED.
     let mut led_pin = pins.led.into_push_pull_output();
 
     loop {