move IXBench code under ixwebsocker folder

ixwebsocket/IXBench.h

@@ -0,0 +1,28 @@
+/*
+ *  IXBench.h
+ *  Author: Benjamin Sergeant
+ *  Copyright (c) 2017-2020 Machine Zone, Inc. All rights reserved.
+ */
+
+#include <chrono>
+#include <stdint.h>
+#include <string>
+
+namespace ix
+{
+    class Bench
+    {
+    public:
+        Bench(const std::string& description);
+        ~Bench();
+
+        void report();
+        uint64_t getDuration() const;
+
+    private:
+        std::string _description;
+        std::chrono::time_point<std::chrono::high_resolution_clock> _start;
+        uint64_t _ms;
+        bool _reported;
+    };
+} // namespace ix