[Docs] : Update Readme

[Parul1606]

I would like to add missing 2-3 commands in the readme like cd resource-gallery, git remote add upstream, git remote -v, git pull.

Screenshot:-

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Hey👋🏼, @Parul1606, thank you for opening an issue. You need to update or make PR in under 7 days

Soon the maintainers/owner will review it and provide you with feedback/suggestions.
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