WifiScannerLinux - registration of Wi-Fi scanner thread

main-thread-handling-registration.cpp

    // Create a std::promise object
    std::promise<void> exitSignal;

    //Fetch std::future object associated with promise
    std::future<void> futureObj = exitSignal.get_future();

    // Starting Thread & move the future object in lambda function by reference
    std::thread th(&wifiScannerThread, std::move(futureObj), wifiIfName, wifiAPCollection);