Add a debug mode for file handling

[danielebarbaro]

Hi, thanks for the great work.

As a Developer, I need to know step by step what files are processed by this tools and I need to know when the server gives me a response.

I added a new parameter debugMode for those guys that have my needs. I also wrote a few lines in the readme file.

I hope you can merge my PR :) I'm open to changing the messages if you don't like them as they are.

Cheers 🖖🏼 Daniele