Windows Google Sheet Data Entry

I need a small, reliable Windows-only app that lets me type in text and numbers and immediately pushes each record into a specific Google Sheet. All data will be entered manually from the keyboard—no file imports and no image capture—so the interface can stay simple: a few labeled fields, a submit button, and clear feedback that the row was added successfully.

The sheet is already live in my Google Drive; you will handle the OAuth flow (service account or installed-app flow, whichever is smoother) and make sure the API credentials are stored securely on the user’s machine. A lightweight UI in .NET (WinForms, WPF or MAUI), Electron, or even a packaged Python script with Tkinter is fine as long as it installs cleanly and runs on current Windows 10/11.

Deliverables
• Compiled Windows installer or portable EXE
• Source code with concise comments
• A short README covering setup of Google API keys and any runtime prerequisites

Acceptance
• I enter text and numbers, click Submit, and a new row appears in the designated sheet.
• Empty fields are validated client-side; no crashes on bad input.
• Network or credential errors are surfaced with a clear message rather than silent failure.

Future expansion to Android or iPhone would be nice to keep in mind, but the first milestone is a solid Windows build that meets the criteria above.