[DOCS] Missing git pull upstream command in CONTRIBUTING.md

[Amruta7203]

Issue Description

Contributing.md file does not contain the git pull upstream main command. This command is crucial to implement before performing any changes. This ensures that the user first pulls the updated code before making any changes.

Screenshots or Examples (if applicable)

The current contributing.md file does not contain the pull command.

Proposed Solution (optional)

The command to include:

Checklist

• [X] I have checked the existing issues
• [X] I have read the Contributing Guidelines
• [X] I am willing to work on this issue (optional)

[github-actions[bot]]

Hello Amruta7203! Thank you for raising this issue! 😊 Your contribution is valuable to us! 😊

Please make sure to follow our Contributing Guidelines. 💪🏻

Please only work on an issue if you're assigned; otherwise, the PR will be automatically closed. Our review team will carefully assess the issue and reach out to you soon! 😇 We appreciate your patience!

[Amruta7203]

@Nishitbaria Request you to assign this issue to me under GSSOC'24

[Amruta7203]

@Nishitbaria Request you to add the gssoc label and relevant level label. Thank you.

[Amruta7203]

@Nishitbaria pls add the gssoc labels to this issue otherwise is won't be counted.