Haiku demo app

Demo.c

#include "Demo.h"
#include <StringView.h>
#include <Window.h>

Demo::Demo(void) : BApplication("application/x-vnd.Demo") {
    BRect rect(150, 150, 500, 500);

    BWindow *win = new BWindow(
        rect, "Demo", 
        B_TITLED_WINDOW,
        B_QUIT_ON_WINDOW_CLOSE
    );

    win -> Show();
}

int main(void) {
    Demo *app = new Demo();

    app -> Run();
    delete app;

    return 0;
}

Demo.h

#include <Application.h>

class Demo : public BApplication {
        public:
                Demo(void);
};