Add project files.

PolyChat/Models/ChatPartner.cs

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+using SocketIOSharp.Server.Client;
+using System.Collections.ObjectModel;
+
+namespace PolyChat.Models
+{
+    public class ChatPartner
+    {
+        public string Name;
+        public string Code;
+        public ObservableCollection<ChatMessage> Messages;
+        private SocketIOSocket socketIOSocket;
+
+        public ChatPartner(string name, string code, ObservableCollection<ChatMessage> messages = null)
+        {
+            Name = name;
+            Code = code;
+            if (messages == null) Messages = new ObservableCollection<ChatMessage>();
+            else Messages = messages;
+        }
+
+        public SocketIOSocket SocketIOSocket { get => socketIOSocket; set => socketIOSocket = value; }
+
+        public void AddMessage(ChatMessage message)
+        {
+            Messages.Add(message);
+        }
+    }
+}