Remember password functionality

Homework

• I took the time to write a good, descriptive issue title
• I read nativefier --help and API.md, no existing option fits my needs.
• I checked CATALOG.md for community suggestions & workarounds.
• I searched existing issues, open & closed. Yes, my feature request is new.
• I'm running the latest version. Yes, the feature I'm requesting isn't in it.

Problem statement

Currently Nativefier gives no option to save the password for later login. It would be great if this were implemented (just like in any browser), it would be very useful for non-tech savy users.

Motivation & context

I'd like to distribute a webapp in a sandbox package using nativefier in my company. However, the fact that it doesn't remember the password makes it a no-go, since it would be really inconvenient for users to have to enter their password every single time, the users would complain a lot (the site I want to use it with doesn't keep you logged in between sessions).