Add the CMMomentum model

MarketData/MarketDataLib/Generator/Model/RealtimeGainLoss.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MarketData.Generator.Model
+{
+  public class RealtimeGainLoss
+  {
+    public double Exposure{get;set;}
+    public double MarketValue{get;set;}
+    public double GainLoss{get{return MarketValue-Exposure;}}
+    public double GainLossPercent{get{return Exposure==0?0:(MarketValue-Exposure)/Exposure;}}
+  }
+}