Add instructions in CONTRIBUTING.md for adding upstream remote about hacktoberfest HOT 5 CLOSED

@ows-ali ,
I will grab this as well. Thanks.

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Sure @seancyw, please add your name in Contributors list as well 😊

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@ows-ali ,
the changes is updated. Please check and merged the changes if no further comment. :)

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@seancyw great work. And somewhat different from what I will do. Like for step 2 I will do git pull from upstream and then make any changes and git push origin master.
But both works.
Can you please make a small change? It is not necessary to use master branch in forked repo as you mentioned in Step 3, so can you add that they can use master or their own new branch?

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Thanks for resolving the issue @seancyw

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