Notifications example for v9

NotificationsHandler.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Umbraco.Cms.Core.DependencyInjection;
using Umbraco.Cms.Core.Notifications;

namespace UmbracoHackathon.Notifications
{
    public static class NotificationsHandler
    {
        public static IUmbracoBuilder AddPublishNotifications(this IUmbracoBuilder builder)
        {
            builder.AddNotificationHandler<ContentPublishingNotification, DiscordNotification>();
            return builder;
        }
    }
}