Initial Client/Server Communication

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

Assets/Scripts/ServerShared/MessagePackObjects/Requests.cs

@@ -0,0 +1,17 @@
+using MessagePack;
+
+namespace ChatApp.Shared.MessagePackObjects
+{
+    /// <summary>
+    /// Room participation information
+    /// </summary>
+    [MessagePackObject]
+    public struct JoinRequest
+    {
+        [Key(0)]
+        public string RoomName { get; set; }
+
+        [Key(1)]
+        public string UserName { get; set; }
+    }
+}