Add QT hello example source code and build shell script

guowenxue

2022-04-08 62e57ba339263e0737ec28418bf3fe730535f675

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#include <QGuiApplication> 
#include <QQmlApplicationEngine> 
 
int main(int argc, char *argv[]) 
{ 
    QGuiApplication app(argc, argv); 
 
    QQmlApplicationEngine engine; 
    engine.load(QUrl(QStringLiteral("qrc:/main.qml"))); 
 
    return app.exec(); 
}