Issue #93: Added event OnTradeTransaction. Udpated json.mqh to fix JSONNumber for correct serialization zero integer value".

MtApi5/Mt5TradeTransactionEventArgs.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace MtApi5
+{
+    public class Mt5TradeTransactionEventArgs : EventArgs
+    {
+        public int ExpertHandle { get; set; }
+        public MqlTradeTransaction Trans { get; set; }  // trade transaction structure 
+        public MqlTradeRequest Request { get; set; }    // request structure
+        public MqlTradeResult Result { get; set; }      // result structure 
+    }
+}