Update CONTRIBUTING.md

[PradnyaGaitonde]

🛠️ Fixes Issue

closes #834

👨‍💻 Changes proposed

Successfully added instructions to contribute using GitHub Desktop.

✔️ Check List (Check all the applicable boxes)

• My code follows the code style of this project.
• This PR does not contain plagiarized content.
• The title of my pull request is a short description of the requested changes.

📄 Note to reviewers

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[PradnyaGaitonde]

@SauravMukherjee44 Kindly review and merge