Add desktop app

requirement_desktop.txt

@@ -0,0 +1,12 @@
+# QBO Excel Sync Desktop App Requirements
+# Install with: pip install -r requirements_desktop.txt
+
+# Core dependencies (same as web app)
+requests>=2.31.0
+openpyxl>=3.1.2
+
+# Windows-specific (for QuickBooks Desktop)
+pywin32>=306; sys_platform == 'win32'
+
+# Note: tkinter is included with Python on Windows
+# On Linux, install with: sudo apt-get install python3-tk