Added RPC channel and guild entities, Get and Select methods

src/Discord.Net.Rpc/Entities/Channels/RpcChannelSummary.cs

@@ -0,0 +1,32 @@
+using System.Diagnostics;
+using Model = Discord.API.Rpc.ChannelSummary;
+
+namespace Discord.Rpc
+{
+    [DebuggerDisplay(@"{DebuggerDisplay,nq}")]
+    public class RpcChannelSummary
+    {
+        public ulong Id { get; }
+        public string Name { get; set; }
+        public ChannelType Type { get; set; }
+
+        internal RpcChannelSummary(ulong id)
+        {
+            Id = id;
+        }
+        internal static RpcChannelSummary Create(Model model)
+        {
+            var entity = new RpcChannelSummary(model.Id);
+            entity.Update(model);
+            return entity;
+        }
+        internal void Update(Model model)
+        {
+            Name = model.Name;
+            Type = model.Type;
+        }
+
+        public override string ToString() => Name;
+        private string DebuggerDisplay => $"{Name} ({Id}, {Type})";
+    }
+}