init, separate crkbd config from qmk tree

lib/timelogger.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include "timer.h"
+
+char timelog_str[24] = {};
+int last_time = 0;
+int elapsed_time = 0;
+
+void set_timelog(void) {
+  elapsed_time = timer_elapsed(last_time);
+  last_time = timer_read();
+  snprintf(timelog_str, sizeof(timelog_str), "lt:%5d, et:%5d", last_time, elapsed_time);
+}
+
+const char *read_timelog(void) {
+  return timelog_str;
+}