Update README

Yuhang Zhao

2024-05-28 79c0602a1f0d80e5babe5f0f0b514189b6823540

 examples/mainwindow/mainwindow.h

@@ -30,6 +30,8 @@
protected:
    bool event(QEvent *event) override;

    void closeEvent(QCloseEvent *event) override;

private:
    void installWindowAgent();
    void loadStyleSheet(Theme theme);