Shared exchange functionality (#214)

CryptoExchange.Net/SharedApis/ResponseModels/SharedFundingRate.cs

@@ -0,0 +1,28 @@
+using System;
+
+namespace CryptoExchange.Net.SharedApis
+{
+    /// <summary>
+    /// Funding rate
+    /// </summary>
+    public record SharedFundingRate
+    {
+        /// <summary>
+        /// The funding rate
+        /// </summary>
+        public decimal FundingRate { get; set; }
+        /// <summary>
+        /// Timestamp
+        /// </summary>
+        public DateTime Timestamp { get; set; }
+
+        /// <summary>
+        /// ctor
+        /// </summary>
+        public SharedFundingRate(decimal fundingRate, DateTime timestamp)
+        {
+            FundingRate = fundingRate;
+            Timestamp = timestamp;
+        }
+    }
+}