Initial Client/Server Communication

#1
Followed the MagicOnion quickstart guide, borrowing code from the chat sample app to get something working

Assets/Scripts/MessagePack/Formatters/DateTimeFormatters.cs

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+// Copyright (c) All contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+
+#pragma warning disable SA1649 // File name should match first type name
+
+namespace MessagePack.Formatters
+{
+    /// <summary>
+    /// Serialize by .NET native DateTime binary format.
+    /// </summary>
+    public sealed class NativeDateTimeFormatter : IMessagePackFormatter<DateTime>
+    {
+        public static readonly NativeDateTimeFormatter Instance = new NativeDateTimeFormatter();
+
+        public void Serialize(ref MessagePackWriter writer, DateTime value, MessagePackSerializerOptions options)
+        {
+            var dateData = value.ToBinary();
+            writer.Write(dateData);
+        }
+
+        public DateTime Deserialize(ref MessagePackReader reader, MessagePackSerializerOptions options)
+        {
+            var dateData = reader.ReadInt64();
+            return DateTime.FromBinary(dateData);
+        }
+    }
+
+    public sealed class NativeDateTimeArrayFormatter : IMessagePackFormatter<DateTime[]>
+    {
+        public static readonly NativeDateTimeArrayFormatter Instance = new NativeDateTimeArrayFormatter();
+
+        public void Serialize(ref MessagePackWriter writer, DateTime[] value, MessagePackSerializerOptions options)
+        {
+            if (value == null)
+            {
+                writer.WriteNil();
+            }
+            else
+            {
+                writer.WriteArrayHeader(value.Length);
+                for (int i = 0; i < value.Length; i++)
+                {
+                    writer.Write(value[i].ToBinary());
+                }
+            }
+        }
+
+        public DateTime[] Deserialize(ref MessagePackReader reader, MessagePackSerializerOptions options)
+        {
+            if (reader.TryReadNil())
+            {
+                return null;
+            }
+            else
+            {
+                var len = reader.ReadArrayHeader();
+                var array = new DateTime[len];
+                for (int i = 0; i < array.Length; i++)
+                {
+                    var dateData = reader.ReadInt64();
+                    array[i] = DateTime.FromBinary(dateData);
+                }
+
+                return array;
+            }
+        }
+    }
+}