init commit

include/host_timer.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <chrono>
+
+class HostTimer {
+private:
+    using clock = std::chrono::high_resolution_clock;
+
+    clock::time_point start;
+
+public:
+    HostTimer();
+    void reset();
+    double elapsed() const;
+};