Add CPF generator

[rohlacanna]

I've added:

CPF Generator (Individual Identification Register) of Brazil.

Ref: https://en.wikipedia.org/wiki/CPF_number

• [x] USAGE.md docs if applicable
• [x] CHANGELOG.md

[caike]

Nice! This will be very helpful 🙏

[arielmdc]

Very good!

[giovanna-science]

Ótimo. Era o que eu estava precisando!

[digzom]

finally!! I've wanted this for a long time

[LukeberryPi]

up!