added code from unity

Runtime/LogEntry.cs

@@ -0,0 +1,20 @@
+using System;
+using Newtonsoft.Json;
+
+namespace Jovian.InGameLogging {
+    [Serializable]
+    public readonly struct LogEntry {
+        [JsonProperty] public readonly string message;
+
+        [JsonProperty] [JsonConverter(typeof(LogChannelJsonConverter))]
+        public readonly LogChannel channel;
+
+        [JsonProperty] public readonly float gameTime;
+
+        public LogEntry(string message, LogChannel channel, float gameTime) {
+            this.message = message;
+            this.channel = channel;
+            this.gameTime = gameTime;
+        }
+    }
+}