Document new password policy introduced in 8.0

[thomasnares]

Questions	Answers
Branch?	1.7.x / 8.x
Description?	Documentation about the new password policy with zxcvbn introduced in 8.0
Related PR?	PrestaShop/classic-theme#21 , PrestaShop/PrestaShop#28127 , #1436

[thomasnares]

@NeOMakinG you may have suggestions for me about what to document on the frontend part ?
@PierreRambaud you may also have suggestions for me about backend part 👍

[eternoendless]

Don't you think it would be more interesting to document this from a system reference standpoint rather from a "how to update your software"? I think it could be overly specific otherwise.

Or perhaps the doc can be split in two: one which explains how the password policy is integrated with customers and employees (for reference), and another one that describes how to update existing code (useful for upgrade only).

[thomasnares]

Does this look better with the new commit ?

[NeOMakinG]

@NeOMakinG you may have suggestions for me about what to document on the frontend part ? @PierreRambaud you may also have suggestions for me about backend part 👍

I guess that's fine enough, we may talk about the fact that Zxcbn is loaded async on core.js side because his size is huge but that's it, nothing else to explain