docs: update readme with faq

[jaikumar-tj]

Summary

I added a contribution section by collating all the answers I got in slack, so it would be helpful for other developers.

Please feel free to modfiy the text content.

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Latest commit: 8e62fbc

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[jaikumar-tj]

Thank you @valoriecarli & @Sarah4VT for the quick review and for making the content appropriate.