Add created new OrderBook class and its functions

CM2005 Object Oriented Programming/Topic 4/4.1.3/OrderBookEntry.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <string>
+
+enum class OrderBookType{bid, ask, unknown};
+
+class OrderBookEntry
+{
+    public:
+
+        OrderBookEntry( double _price, 
+                        double _amount, 
+                        std::string _timestamp, 
+                        std::string _product, 
+                        OrderBookType _orderType);
+
+        static OrderBookType stringToOrderBookType(std::string s);
+
+        double price;
+        double amount;
+        std::string timestamp;
+        std::string product;
+        OrderBookType orderType;
+};
+