Provides credentials to authentication requests

Example

fin.Application.wrap('OpenfinPOC').then(app => {
    app.on('window-auth-requested', evt => {
        let win = fin.Window.wrap({ uuid: evt.uuid, name: evt.name});
        win.authenticate('userName', 'P@assw0rd').then(()=> console.log('authenticated')).catch(err => console.log(err));
    });
});