Upgrade Readme

[PranjaliBhardwaj]

OLD Readme have very less information

New updated Readme consist of needy information.

[PranjaliBhardwaj]

@mariobehling Necessary changes are required in Readme, merge my pull request.

[Vikas4245]

If this issue still open i would like to work on this.Let me know if it is still open .

[SanviTripathi]

hey there wanted to know if the issue is still open! Would like to contribute for the same.
If you could assign it to me.

[bhargavikondaka]

Hi! I'm Bhargavi, a beginner contributor with experience in HTML, CSS, and JavaScript.
I would like to work on updating the README as mentioned in this issue.
Could you please assign it to me?