Initial Client/Server Communication

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

Assets/Scripts/MessagePack/Resolvers/NativeDecimalResolver.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;
+using MessagePack.Formatters;
+
+namespace MessagePack.Resolvers
+{
+    public sealed class NativeDecimalResolver : IFormatterResolver
+    {
+        /// <summary>
+        /// The singleton instance that can be used.
+        /// </summary>
+        public static readonly NativeDecimalResolver Instance = new NativeDecimalResolver();
+
+        private NativeDecimalResolver()
+        {
+        }
+
+        public IMessagePackFormatter<T> GetFormatter<T>()
+        {
+            return FormatterCache<T>.Formatter;
+        }
+
+        private static object GetFormatterHelper(Type t)
+        {
+            if (t == typeof(Decimal))
+            {
+                return NativeDecimalFormatter.Instance;
+            }
+            else if (t == typeof(Decimal?))
+            {
+                return new StaticNullableFormatter<Decimal>(NativeDecimalFormatter.Instance);
+            }
+
+            return null;
+        }
+
+        private static class FormatterCache<T>
+        {
+            public static readonly IMessagePackFormatter<T> Formatter;
+
+            static FormatterCache()
+            {
+                Formatter = (IMessagePackFormatter<T>)GetFormatterHelper(typeof(T));
+            }
+        }
+    }
+}