Documentation needs to be updated

[shamim-42]

I was going through the codebase, it's a well organized project.
By the way, maybe the documentation (Readme of main branch) is not updated according to the new changes. I am seeing there is a folder core inside the lib folder which is a sibling of data folder, but there is no written details in the documentation about this core folder.
I would request the owner to update the documentation.
Thanks!