Added newly added categories in Readme

[hars-21]

Fixes Issue🛠️

Closes #1250

Description👨‍💻

Hi @Rakesh9100 I have added 3 categories in Readme file which were missing.

Type of Change📄

• [ ] Bug fix (non-breaking change which fixes a bug)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Style (non-breaking change which improves website style or formatting)
• [x] Documentation (non-breaking change which updates or adds documentation)
• [ ] Responsiveness (non-breaking change which improves UI/UX on different screen sizes)

Checklist✅

• [x] I am an Open Source contributor
• [x] I have performed a self-review of my code
• [x] My code follows the style guidelines of this project
• [x] I have commented on my code, particularly in hard-to-understand areas

Screenshots/GIF📷

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[hars-21]

@Rakesh9100 Please review

[hars-21]

@Rakesh9100 Please can you review this PR and merge it asap. Please!!

[github-actions[bot]]

Congrats, Your pull request has been successfully merged 🥳🎉 Thank you for your contribution to my project 🚀 Keep Contributing!! ✨ @hars-21