MafiaTelegramBot/MafiaTelegramBot/Models/Commands/StartCommand.cs

using System.Threading.Tasks;
using Telegram.Bot;
using Telegram.Bot.Types;
using Telegram.Bot.Types.Enums;
using Telegram.Bot.Types.ReplyMarkups;

namespace MafiaTelegramBot.Models.Commands
{
    public class StartCommand : Command
    {
        protected override string Name => "/start";

        protected override async Task<Message> Execute(Update update, TelegramBotClient client)
        {
            await Bot.Get().SendChatActionAsync(update.Message.Chat.Id, ChatAction.Typing);
            ReplyKeyboardMarkup keyboard = new(
                new[]
                {
                    new KeyboardButton[] {strings.create_game},
                    new KeyboardButton[] {strings.connect_game},
                    new KeyboardButton[] {strings.show_profile}
                },
                true
            );
            return await Bot.Get().SendTextMessageAsync(update.Message.Chat.Id, strings.start_message, replyMarkup: keyboard);
        }
    }
}