Add the Linked List README.md

[Yashi11]

Is your feature request related to a problem? Please describe. There are no theoretical details about the data-structure or algorithm in the Repository, which can be a bit troublesome for beginners who know very little about the concepts behind the code.

Describe the solution you'd like I would like to add the Linked List README.md file so that it contains an interactive file for over viewing concepts related to Linked Lists.

Describe alternatives you've considered I can take suggestions from other and improve on the concepts, while adding same to other folders as well.

Please assign the same to me under SSOC'23. @Kumar-laxmi

[PadmeshSharma]

Please assign this issue to me under SSOC'23. @Kumar-laxmi

[github-actions[bot]]

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