chore: scaffold PySide6 application

src/main.py

@@ -0,0 +1,20 @@
+import sys
+
+from PySide6.QtWidgets import QApplication
+
+from app.main_window import MainWindow
+from version import APP_NAME
+
+
+def main():
+    app = QApplication(sys.argv)
+    app.setApplicationName(APP_NAME)
+
+    window = MainWindow()
+    window.show()
+
+    return app.exec()
+
+
+if __name__ == "__main__":
+    sys.exit(main())