Add blinky example (which doesn't blink a LED, yet)

src/examples/blinky/blinky.go

@@ -0,0 +1,14 @@
+
+package main
+
+import "runtime"
+
+func main() {
+	for {
+		// TODO: enable/disable actual LED
+		println("LED on")
+		runtime.Sleep(runtime.Millisecond * 250)
+		println("LED off")
+		runtime.Sleep(runtime.Millisecond * 250)
+	}
+}