Add project files.

Discord/Structures/AvatarDecorationData.cs

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+namespace Discord
+{
+    public class AvatarDecorationData : Base
+    {
+        public required string Asset { get; set; }
+        public required string SkuId { get; set; }
+
+        public override string ToString()
+        {
+            return JSON.Serialize(this);
+        }
+    }
+}

Discord/Structures/Channel.cs

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+using Discord.Managers;
+using Discord.REST.Payloads;
+
+namespace Discord
+{
+    public class Channel : Base
+    {
+        public required string Id { get; set; }
+        public required int Type { get; set; }
+        public string? Name { get; set; }
+        public MessageManager? Messages { get; set; }
+
+        public async Task<Message?> Send(string content)
+        {
+            return await Client!.Rest.Post<Message, MessagePayload>(REST.Routes.Messages(Id), 
+                new MessagePayload() { 
+                    Content = content
+                });
+        }
+
+        public override string ToString()
+        {
+            return JSON.Serialize(this);
+        }
+    }
+}

Discord/Structures/Message.cs

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+namespace Discord
+{
+    public class Message : Base
+    {
+        public required string Id {  get; set; }
+        public required string ChannelId { get; set; }
+        public Channel Channel { get { return Client!.Channels.Get(ChannelId).Result!; } }
+        public required User Author { get; set; }
+        public required string Content { get; set; }
+        public required bool Tts { get; set; }
+        public required bool MentionEveryone { get; set; }
+        public required List<User> Mentions { get; set; }
+
+        public override string ToString()
+        {
+            return JSON.Serialize(this);
+        }
+    }
+}

Discord/Structures/User.cs

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+namespace Discord
+{
+    public class User : Base
+    {
+        public required string Id { get; set; }
+        public required string Username { get; set; }
+        public required string Discriminator { get; set; }
+        public required string? GlobalName { get; set; }
+        public required string? Avatar { get; set; }
+        public bool Bot { get; set; }
+        public bool System { get; set; }
+        public bool MfaEnabled { get; set; }
+        public string? Banner { get; set; }
+        public int? AccentColor { get; set; }
+        public string? Locale { get; set; }
+        public bool Verified { get; set; }
+        public string? Email { get; set; }
+        public int Flags { get; set; }
+        public int PremiumType { get; set; }
+        public int PublicFlags { get; set; }
+        public AvatarDecorationData? AvatarDecorationData { get; set; }
+
+        public override string ToString()
+        {
+            return JSON.Serialize(this);
+        }
+    }
+}