Added rate limit update event

CryptoExchange.Net/RateLimiting/RateLimitUpdateEvent.cs

@@ -0,0 +1,50 @@
+using CryptoExchange.Net.Objects;
+using System;
+
+namespace CryptoExchange.Net.RateLimiting
+{
+    /// <summary>
+    /// Rate limit update event
+    /// </summary>
+    public record RateLimitUpdateEvent
+    {
+        /// <summary>
+        /// Id of the item the limit was checked for
+        /// </summary>
+        public int ItemId { get; set; }
+        /// <summary>
+        /// Name of the API limit that is reached
+        /// </summary>
+        public string ApiLimit { get; set; } = string.Empty;
+        /// <summary>
+        /// Description of the limit that is reached
+        /// </summary>
+        public string LimitDescription { get; set; } = string.Empty;
+        /// <summary>
+        /// The current counter value
+        /// </summary>
+        public int Current { get; set; }
+        /// <summary>
+        /// The limit per time period
+        /// </summary>
+        public int? Limit { get; set; }
+        /// <summary>
+        /// The time period the limit is for
+        /// </summary>
+        public TimeSpan? TimePeriod { get; set; }
+
+        /// <summary>
+        /// ctor
+        /// </summary>
+        public RateLimitUpdateEvent(int itemId, string apiLimit, string limitDescription, int current, int? limit, TimeSpan? timePeriod)
+        {
+            ItemId = itemId;
+            ApiLimit = apiLimit;
+            LimitDescription = limitDescription;
+            Current = current;
+            Limit = limit;
+            TimePeriod = timePeriod;
+        }
+
+    }
+}