Added proper README

- Also contains new simple blinky example
- Small CI update

examples/blinky.rs

@@ -0,0 +1,45 @@
+//! Simple blinky example
+//!
+//! Additional note on LEDs when using the REB1 development board:
+//! Be not afraid: Pulling the GPIOs low makes the LEDs blink. See REB1
+//! schematic for more details.
+#![no_main]
+#![no_std]
+
+use cortex_m_rt::entry;
+use embedded_hal::digital::v2::ToggleableOutputPin;
+use panic_halt as _;
+use va108xx_hal::{pac, prelude::*};
+
+#[entry]
+fn main() -> ! {
+    let mut dp = pac::Peripherals::take().unwrap();
+    let porta = dp.PORTA.split(&mut dp.SYSCONFIG).unwrap();
+    let mut led1 = porta
+        .pa10
+        .into_push_pull_output(&mut dp.IOCONFIG, &mut dp.PORTA);
+    let mut led2 = porta
+        .pa7
+        .into_push_pull_output(&mut dp.IOCONFIG, &mut dp.PORTA);
+    let mut led3 = porta
+        .pa6
+        .into_push_pull_output(&mut dp.IOCONFIG, &mut dp.PORTA);
+    for _ in 0..10 {
+        led1.set_low().ok();
+        led2.set_low().ok();
+        led3.set_low().ok();
+        cortex_m::asm::delay(5_000_000);
+        led1.set_high().ok();
+        led2.set_high().ok();
+        led3.set_high().ok();
+        cortex_m::asm::delay(5_000_000);
+    }
+    loop {
+        led1.toggle().ok();
+        cortex_m::asm::delay(5_000_000);
+        led2.toggle().ok();
+        cortex_m::asm::delay(5_000_000);
+        led3.toggle().ok();
+        cortex_m::asm::delay(5_000_000);
+    }
+}