Welcome message update

src/core/controller.cpp

@@ -228,7 +228,7 @@ void Controller::enableTrayIcon() {
     m_trayIcon->show();
     if (ConfigHandler().showStartupLaunchMessage()) {
         m_trayIcon->showMessage("Flameshot",
-                                QObject::tr("Application is started successfully"),
+                                QObject::tr("Hello, I'm here! Click icon in the tray to take a screenshot or click with a right button to see more options."),
                                 QSystemTrayIcon::Information,
                                 3000);
     }