Added a simple method for subscribing to events.

Bus/ServiceBusCentral.cs

@@ -37,7 +37,7 @@ namespace TwitchChatTTS.Bus
             {
                 if (!_topics.TryGetValue(topic, out var bus))
                 {
-                    bus = new ServiceBusObservable(topic, this);
+                    bus = new ServiceBusObservable(topic, this, _logger);
                     _topics.Add(topic, bus);
                 }
                 return bus;

Bus/ServiceBusObservable.cs

@@ -1,4 +1,5 @@
 using System.Reactive;
+using Serilog;
 
 namespace TwitchChatTTS.Bus
 {
@@ -6,11 +7,13 @@ namespace TwitchChatTTS.Bus
     {
         private readonly string _topic;
         private readonly ServiceBusCentral _central;
+        private readonly ILogger _logger;
 
-        public ServiceBusObservable(string topic, ServiceBusCentral central)
+        public ServiceBusObservable(string topic, ServiceBusCentral central, ILogger logger)
         {
             _topic = topic;
             _central = central;
+            _logger = logger;
         }
 
         protected override IDisposable SubscribeCore(IObserver<ServiceBusData> observer)
@@ -19,6 +22,10 @@ namespace TwitchChatTTS.Bus
             return new ServiceBusUnsubscriber(_topic, _central, observer);
         }
 
+        public IDisposable Subscribe(Action<ServiceBusData> action) {
+            return Subscribe(new ServiceBusObserver(action, _logger));
+        }
+
         private sealed class ServiceBusUnsubscriber : IDisposable
         {
             private readonly string _topic;