commiting code that didnt work properly on new branch

include/timer_msec.h

@@ -0,0 +1,10 @@
+#pragma once
+
+class Timer_msec
+{
+public:
+    Timer_msec();
+    void init(int period_ms);
+    void init(int period_ms, int duty_cycle);
+    void set_duty_cycle(int duty_cycle);
+};