Added reference project

ref/Entities/Channels/IChannel.cs

@@ -0,0 +1,17 @@
+using System.Collections.Generic;
+
+namespace Discord
+{
+    public interface IChannel : IModel<ulong>
+    {
+        DiscordClient Client { get; }
+        
+        ChannelType Type { get; }
+        bool IsText { get; }
+        bool IsVoice { get; }
+        bool IsPrivate { get; }
+        bool IsPublic { get; }
+        
+        IEnumerable<User> Users { get; }
+    }
+}