ExamplePlugin.cs

using QuantumMC.Plugin;
using QuantumMC.Event;
using QuantumMC.Event.Impl;

namespace ExamplePlugin
{
    [Plugin(
        Name = "ExamplePlugin",
        Version = "1.0.0",
        Authors = "xRookieFight",
        Description = "Example plugin for QuantumMC"
    )]
    public class ExamplePlugin : PluginBase, Listener
    {
        public override Task OnEnable()
        {
            Logger.Information("ExamplePlugin has been enabled!");
            RegisterListener(this);
            return Task.CompletedTask;
        }

        public override Task OnDisable()
        {
            Logger.Information("ExamplePlugin has been disabled!");
            return Task.CompletedTask;
        }

        [EventHandler]
        public void OnPlayerJoin(PlayerJoinEvent @event)
        {
            @event.JoinMessage = "{@event.Player.Username} joined the server.";

            @event.Player.SendMessage("Welcome to QuantumMC, {@event.Player.Username}!");
        }

        [EventHandler]
        public void OnPlayerQuit(PlayerQuitEvent @event)
        {
            @event.QuitMessage = "{@event.Player.Username} left the server.";
        }
    }
}