Add mocked broker client

Hcs.WebApp/Services/MockClientProvider.cs

@@ -0,0 +1,19 @@
+using Hcs.Broker;
+using Hcs.Broker.MessageCapturer;
+using Hcs.Broker.Mock;
+using Hcs.WebApp.Config;
+
+namespace Hcs.WebApp.Services
+{
+    public class MockClientProvider : IClientProvider
+    {
+        public IClient CreateClient(BrokerConfig config, Broker.Logger.ILogger logger, IMessageCapturer messageCapturer)
+        {
+#if USE_MOCK
+            return new MockClient();
+#else
+            return null;
+#endif
+        }
+    }
+}