[apps] Create a LED timer

Change-Id: Ice5a5fbf9fdf7b493597aa9542206372ebf0ae81

apps/led_timer.cpp

@@ -0,0 +1,13 @@
+#include "led_timer.h"
+
+LedTimer::LedTimer() :
+  Timer(1),
+  m_on(false)
+{
+}
+
+void LedTimer::fire() {
+  m_on = !m_on;
+  KDColor ledColor = m_on ? KDColorRed : KDColorBlack;
+  Ion::LED::setColor(ledColor);
+}