Add doc-specific example and add it to CI

docs/modules/ROOT/examples/basic/.cargo/config.toml

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+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+# replace nRF82840_xxAA with your chip as listed in `probe-run --list-chips`
+runner = "probe-run --chip nRF52840_xxAA"
+
+[build]
+target = "thumbv7em-none-eabi"

docs/modules/ROOT/examples/basic/Cargo.toml

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+[package]
+authors = ["Dario Nieuwenhuis <dirbaio@dirbaio.net>"]
+edition = "2018"
+name = "embassy-basic-example"
+version = "0.1.0"
+
+[dependencies]
+embassy = { version = "0.1.0", path = "../../../../embassy", features = ["defmt"] }
+embassy-traits = { version = "0.1.0", path = "../../../../embassy-traits", features = ["defmt"] }
+embassy-nrf = { version = "0.1.0", path = "../../../../embassy-nrf", features = ["defmt", "nrf52840", "time-driver-rtc1", "gpiote"] }
+
+defmt = "0.3"
+defmt-rtt = "0.3"
+
+cortex-m = "0.7.3"
+cortex-m-rt = "0.7.0"
+embedded-hal = "0.2.6"
+panic-probe = { version = "0.3", features = ["print-defmt"] }

docs/modules/ROOT/examples/basic/src/main.rs

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+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt_rtt as _; // global logger
+use panic_probe as _;
+
+use defmt::*;
+
+use embassy::executor::Spawner;
+use embassy::time::{Duration, Timer};
+use embassy_nrf::gpio::{Level, Output, OutputDrive};
+use embassy_nrf::Peripherals;
+use embedded_hal::digital::v2::OutputPin;
+
+#[embassy::task]
+async fn blinker(mut led: Output<'static, P0_13>, interval: Duration) {
+    loop {
+        unwrap!(led.set_high());
+        Timer::after(interval).await;
+        unwrap!(led.set_low());
+        Timer::after(interval).await;
+    }
+}
+
+#[embassy::main]
+async fn main(spawner: Spawner, p: Peripherals) {
+    let led = Output::new(p.P0_13, Level::Low, OutputDrive::Standard);
+    unwrap!(spawner.spawn(blinker(led, Duration::from_millis(300))));
+}