Initial Client/Server Communication

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

Assets/Scripts/MagicOnion.Abstractions/Client/IResponseContext.cs

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+using Grpc.Core;
+using MessagePack;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MagicOnion.Client
+{
+    public interface IResponseContext : IDisposable
+    {
+        Task<Metadata> ResponseHeadersAsync { get; }
+        Status GetStatus();
+        Metadata GetTrailers();
+        Type ResponseType { get; }
+    }
+
+    public interface IResponseContext<T> : IResponseContext
+    {
+        Task<T> ResponseAsync { get; }
+    }
+}

Assets/Scripts/MagicOnion.Abstractions/Client/IResponseContext.cs.meta

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