Shared exchange functionality (#214)

CryptoExchange.Net/SharedApis/Models/ExchangeEvent.cs

@@ -0,0 +1,33 @@
+using CryptoExchange.Net.Objects.Sockets;
+
+namespace CryptoExchange.Net.SharedApis
+{
+    /// <summary>
+    /// An update event for a specific exchange
+    /// </summary>
+    /// <typeparam name="T">Type of the data</typeparam>
+    public class ExchangeEvent<T> : DataEvent<T>
+    {
+        /// <summary>
+        /// The exchange
+        /// </summary>
+        public string Exchange { get; }
+
+        /// <summary>
+        /// ctor
+        /// </summary>
+        public ExchangeEvent(string exchange, DataEvent<T> evnt) :
+            base(evnt.Data,
+                evnt.StreamId,
+                evnt.Symbol,
+                evnt.OriginalData,
+                evnt.Timestamp,
+                evnt.UpdateType)
+        {
+            Exchange = exchange;
+        }
+
+        /// <inheritdoc />
+        public override string ToString() => $"{Exchange} - " + base.ToString();
+    }
+}