Documentation on Text Preprocessing Techniques

[Praneet0327]

Closes: #19

• Title : Text Preprocessing using NLTK
• Name : Praneet Singh
• Idenitfy yourself: SSOC'24 Contributor

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

This pull request introduces a comprehensive Markdown file that details 21 text preprocessing functions. The guide is structured to provide both theoretical explanations and practical examples for each technique.
This guide will significantly enhance our NLP resources, providing users with a solid foundation in text preprocessing. It will enable effective preprocessing of text data, which is crucial for applying more advanced NLP techniques.

How Has This Been Tested? ⚙️

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 📄

This markdown is open for additional preprocessing techniques to further enhance its utility and comprehensiveness.

[github-actions]

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[Avdhesh-Varshney]

@Praneet0327 PR Approved 🎉