Add support for Windows

With React Native for Windows becoming a viable target, enabling this package for Windows would be a great benefit to the community! (Especially if this package backs uuid, since a library I plan on using in RN uses it.)

I'm willing to take a stab at an initial implementation, and wanted to post this issue as a place to track progress.

Todo:

• Ensure RN for Windows supports synchronous methods It does!
• Decide if C++ or C# would be the most appropriate C# would be the most approachable, and would be just as performant as the C++ version since they're both just calling UWP APIs
• Determine if RN prefers Win32, UWP, or both for third party modules RN for Windows only works on Windows 10, so there's no sense in using the Win32 APIs.
• Setup project (blocked by https://github.com/microsoft/react-native-windows/issues/4211)
• Rewrite module in C++ (blocked by https://github.com/microsoft/react-native-windows/issues/4215)

Es werden keine Dateien, Tests oder Einstiegspunkte genannt. Überprüfe zuerst die abgeschlossenen Setup-Entscheidungen und die verknüpften react-native-windows-Blocker; das Issue ist erledigt, wenn das Modul über eine funktionierende C++-Implementierung mit Unterstützung für Windows verfügt.