chore: scaffold PySide6 application

src/app/main_window.py

@@ -0,0 +1,17 @@
+from PySide6.QtCore import Qt
+from PySide6.QtWidgets import QLabel, QMainWindow
+
+from version import APP_NAME, APP_VERSION
+
+
+class MainWindow(QMainWindow):
+    def __init__(self):
+        super().__init__()
+        self.setWindowTitle("{} v{}".format(APP_NAME, APP_VERSION))
+        self.resize(1280, 720)
+
+        label = QLabel("自动合成印花服饰效果图工具\n\n工程骨架已创建")
+        label.setAlignment(Qt.AlignCenter)
+        self.setCentralWidget(label)
+
+        self.statusBar().showMessage("就绪")