add SymbolsTotal()

MtApi/MtApiClient.cs

@@ -652,6 +652,14 @@ namespace MtApi
 
         #endregion
 
+        #region Symbols
+        public int SymbolsTotal(bool selected)
+        {
+            var commandParameters = new ArrayList { selected };
+            return SendCommand<int>(MtCommandType.SymbolsTotal, commandParameters);
+        }
+        #endregion
+
         #region Common Function
 
         public void Alert(string msg)

MtApi/MtCommandType.cs

@@ -195,6 +195,11 @@ namespace MtApi
         MtRequest                           = 155,
 
         //Backtesting
-        BacktestingReady                    = 156
+        BacktestingReady                    = 156,
+
+        //Symbols
+        SymbolsTotal                        = 200,
+        SymbolName                          = 201,
+        SymbolSelect                        = 202
     }
 }