Explain NLTK setup

[shivansh-2003]

Closes: <#26>

• Title : Explain NLTK setup 🐛: Explain NLTK setup #26
• Name: Shivansh Mahajan
• Idenitfy yourself:

Describe the add-ons or changes you've made 📃

Give a clear description of what have you added or modifications made
delete notebook file. Create a readme file out of notebook file name:- NLTK-Setup.md to add in documentation section

Type of change ☑️

What sort of change have you made:

• This change requires a documentation update

How Has This Been Tested? ⚙️

I have verified my changes by

Checklist: ☑️

• My code follows the Contributing Guidelines & Code of Conduct of this project.
• This PR does not contain plagiarized content.
• I have performed a self-review of my own code.
• I have commented my code, particularly wherever it was hard to understand.
• My changes generate no new warnings.

Screenshots 📷

Note to reviewers 📄

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[Avdhesh-Varshney]

@shivansh-2003 it's good but you have to create your own branch for pr raising and also mention this documentation link in readme file for NLP in next new pr.