Initial Client/Server Communication

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

Assets/Scripts/MessagePack/StringEncoding.cs

@@ -0,0 +1,31 @@
+// 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 System.Diagnostics;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace MessagePack
+{
+    internal static class StringEncoding
+    {
+        internal static readonly Encoding UTF8 = new UTF8Encoding(false);
+
+#if !NETCOREAPP2_1 // Define the extension method only where an instance method does not already exist.
+        internal static unsafe string GetString(this Encoding encoding, ReadOnlySpan<byte> bytes)
+        {
+            if (bytes.Length == 0)
+            {
+                return string.Empty;
+            }
+
+            fixed (byte* pBytes = bytes)
+            {
+                return encoding.GetString(pBytes, bytes.Length);
+            }
+        }
+#endif
+    }
+}