add callsign on display

close #64

src/TaskDisplay.cpp

@@ -21,7 +21,7 @@ bool DisplayTask::setup(std::shared_ptr<Configuration> config, std::shared_ptr<B
 	}
 	std::shared_ptr<StatusFrame> statusFrame = std::shared_ptr<StatusFrame>(new StatusFrame(TaskManager::instance().getTasks()));
 	Display::instance().setStatusFrame(statusFrame);
-	_stateInfo = "";
+	_stateInfo = config->callsign;
 	return true;
 }