Added reference project

ref/Entities/Channels/Channel.cs

@@ -0,0 +1,22 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Discord
+{
+    public abstract class Channel : IChannel
+    {        
+        public ulong Id { get; }
+
+        public abstract DiscordClient Client { get; }
+        public abstract ChannelType Type { get; }
+        public bool IsText { get; }
+        public bool IsVoice { get; }
+        public bool IsPrivate { get; }
+        public bool IsPublic { get; }
+
+        public abstract User CurrentUser { get; }
+        public abstract IEnumerable<User> Users { get; }
+
+        public abstract Task Save();
+    }
+}