Document which open(2) numbers are supported on Windows

[sindresorhus]

So we can link to them from the Node.js docs.

On Windows, some flags are translated to their equivalent ones as accepted by CreateFileW.

nodejs/node#3641 (comment)

[bnoordhuis]

Pull requests welcome although I think we have mappings for all common flags. It should Just Work in most if not all cases.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.