Add small blink example as bootloader payload test

blink/main.cpp

@@ -0,0 +1,30 @@
+#include "clock.hpp"
+
+#include "io/io.hpp"
+
+#include "bootloader.hpp"
+
+int main()
+{
+	io::Pin<io::P::B5> ledPin;
+	ledPin.dir(io::Dir::OUT);
+	ledPin = false;
+
+	Bootloader::init([&ledPin]() {
+		for (uint8_t i = 0; i < 10; ++i) {
+			ledPin = true;
+			_delay_ms(50);
+			ledPin = false;
+			_delay_ms(50);
+		}
+	});
+
+	for (uint8_t i = 0; i < 10; ++i) {
+		ledPin.toggle();
+		_delay_ms(1000);
+	}
+
+	Bootloader::enter();
+
+	return 0;
+}