Worked on runtime and threadpool

include/runtime.h

@@ -0,0 +1,10 @@
+#pragma once
+
+typedef void (*system_tick_t)(int type);
+
+void runtime_init();
+void runtime_loop();
+void runtime_destroy();
+
+int runtime_callback_single(system_tick_t callback, long delay);
+int runtime_callback_many(system_tick_t callback, long period, long phase);