Basic bot

Handler/GoodByeCommand/GoodbyeHandler.cs

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+using Discord.WebSocket;
+using MediatR;
+
+namespace Lunaris2.Handler.GoodByeCommand
+{
+    public record GoodbyeCommand(SocketSlashCommand Message) : IRequest;
+
+    public class GoodbyeHandler : IRequestHandler<GoodbyeCommand>
+    {
+        public async Task Handle(GoodbyeCommand message, CancellationToken cancellationToken)
+        {
+            await message.Message.RespondAsync($"Goodbye, {message.Message.User.Username}! :c");
+        }
+    }
+}