[DOCS] Add multiple READMEs in their respective folders

[Panquesito7]

Description

Currently, we have a readme where it explains the use of the directory builder. However, that guide is outdated, and we do not have guides for the other script(s).

I suggest we add a README.md inside their respective folders explaining what it does, how it works, etc.. Let me know your thoughts about this. Thank you. 🙂