Started adding audio receive

src/Discord.Net.WebSocket/API/Voice/SpeakingEvent.cs

@@ -0,0 +1,15 @@
+#pragma warning disable CS1591
+using Newtonsoft.Json;
+
+namespace Discord.API.Voice
+{
+    internal class SpeakingEvent
+    {
+        [JsonProperty("user_id")]
+        public ulong UserId { get; set; }
+        [JsonProperty("ssrc")]
+        public uint Ssrc { get; set; }
+        [JsonProperty("speaking")]
+        public bool Speaking { get; set; }
+    }
+}