added timers to auto-hide help and for counting the time it took to solve the puzzle

timer.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <sys/time.h>
+extern struct timeval start_time;
+
+typedef struct Timer {
+  float time;
+  float duration;
+  bool is_running;
+} Timer;
+
+
+double get_time();
+void start_internal_timer();
+bool timer_ended(Timer *timer);
+void timer_start(Timer *timer, float duration);
+void timer_reset(Timer *timer);
+float timer_remaining(Timer *timer);
+void timer_stop(Timer *timer);
+float timer_elapsed(Timer *timer);