added gettime and sleep functions

include/tlibc/time.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#if __cplusplus
+extern "C" {
+#endif
+
+#include "std.h"
+
+/// nanoseconds
+typedef u64 nsec_t;
+/// microseconds
+typedef u64 usec_t;
+/// miliseconds
+typedef u64 msec_t;
+
+/// system time now in nanoseconds
+///@return u64 will overflow in 13 years
+nsec_t getTimeNsec();
+
+/// system time now in microseconds
+///@return u64 will overflow in 58494 years
+usec_t getTimeUsec();
+
+void sleepNsec(nsec_t time);
+void sleepUsec(usec_t time);
+void sleepMsec(msec_t time);
+
+#if __cplusplus
+}
+#endif