Repository pre-publish sanitizations

[ArtyomVancyan]

Motivation:

These changes are committed to sanitizing files structure before making the repository public to the community. Also, creating a user-friendly README.

All Submissions:

• [x] Have you followed the guidelines in our Contributing document?
• [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes to Core Features:

• [x] Have you added an explanation of what your changes do and why you'd like us to include them?
• [x] Have you updated the documentation related to the changes you have made?
• [x] Have you written new tests for your core changes, as applicable?
• [x] Have you successfully run tests with your changes locally?