Use a balloon tip to indicate service startup / shutdown.

Refers to #2

ATXTray/AutoTxTray.cs

@@ -138,11 +138,15 @@ namespace ATXTray
                 _miSvcRunning.BackColor = Color.LightGreen;
                 _miTitle.BackColor = Color.LightGreen;
                 _miSvcSuspended.Enabled = true;
+                _notifyIcon.ShowBalloonTip(500, "AutoTx Monitor",
+                    "Service started.", ToolTipIcon.Info);
             } else {
                 _miSvcRunning.Text = @"Service NOT RUNNING!";
                 _miSvcRunning.BackColor = Color.LightCoral;
                 _miTitle.BackColor = Color.LightCoral;
                 _miSvcSuspended.Enabled = false;
+                _notifyIcon.ShowBalloonTip(500, "AutoTx Monitor",
+                    "Service stopped.", ToolTipIcon.Error);
             }
         }
     }