Update README.md

added some details about the instructor's purpose for creating this repository and readme document
Update README.md

added when this document will be used and the freedom of use of version control systems to students
Update README.md

removed the note about the non specific purpose, as that is no longer true
Update README.md

status added
Merge pull request #2 from ShreyaKumar/readme-redo1

Readme redo1