docs: Add instructions for creating and pushing a branch to CONTRIBUTING.md

[tasosbeast]

Fixes Issue #653

My PR closes #653

👨‍💻 Changes proposed(What did you do ?)

• Added a section in the CONTRIBUTING.md file explaining how to create a branch using git checkout.
• Included instructions on how to push the newly created branch.
• Replaced the existing link with the new section link in the CONTRIBUTING.md file.

✔️ 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 and description of the PR is clear and explains the approach.

Note to reviewers

📷 Screenshots

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[Dun-sin]

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