Add "Cook" to related projects in the README

[ItsIgnacioPortal]

An overpower wordlist generator, splitter, merger, finder, permutator, encoder, decoder.. Frustration killer. Customizable. The Wordlist Framework.

https://github.com/giteshnxtlvl/cook

I'm sure someone here will find it handy :p

[g0tmi1k]

Thanks for the suggestion!

Please do open up a pull request with it, and we can accept it :)