feat(projects): 新增PySide综合案例示例代码

projects/gui/quickstart.py

@@ -0,0 +1,20 @@
+import sys
+
+from PySide6.QtWidgets import QApplication, QMessageBox
+
+
+def main():
+    app = QApplication()
+
+    box = QMessageBox()
+    box.setText("Do you attempt to close window?")
+
+    box.setStandardButtons(box.No | box.Yes)
+    box.setDefaultButton(box.Yes)
+    box.show()
+
+    sys.exit(app.exec())
+
+
+if __name__ == '__main__':
+    main()