makepasswd: add page

[Rudloff]

• The page (if new), does not already exist in the repo.
• The page is in the correct platform directory (common/, linux/, etc.)
• The page has 8 or fewer examples.
• The PR title conforms to the recommended templates.
• The page follows the content guidelines.
• The page description includes a link to documentation or a homepage (if applicable).

I could not find any homepage for this command.

[schneiderl]

Hi,
Left a minor comment for you to take a look at.
I'm not requesting changes, just commenting, because I think it can be merged as it is.
By the way, thank you for all your contributions for the last few days.