Update README.md for Portfolio Website

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  Description

  This PR updates the README.md file to provide instructions and information about the portfolio website. It includes a new title, description, setup instructions, purpose and features, and relevant links.

Summary of Changes

• Updated the title of the README.md file to "Portfolio Website using React & JavaScript".
• Added a brief description of the project, mentioning that it is a portfolio website built using React and JavaScript.
• Provided instructions on how to run the website locally, including any dependencies or setup required.
• Included a section explaining the purpose and features of the portfolio website.
• Added relevant links or references to external resources or documentation.

Please review and merge this PR to update the README.md file for the portfolio website.

Fixes #2.

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• [ ] Rollback changes to README.md

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