Update README.md

Found this amazing simple article for explaining the Information Retrieval system behind Instagram's content.

data_science/README.md

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 * :scroll: [Tidy Data] by Hadley Wickham (2014)
 
 [Tidy Data]: https://www.jstatsoft.org/article/view/v059i10
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+## Instagram Post Suggestion Algorithm
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+* :scroll: [How Instagram suggests new content] by Meta Research (2020)
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+[How Instagram suggests new content]: https://engineering.fb.com/2020/12/10/web/how-instagram-suggests-new-content/?utm_source=substack&utm_medium=email