Update README.md

Author: JBris

README.md

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 # r-plumber-tutorials
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+[![pages-build-deployment](https://github.com/JBris/r-plumber-tutorials/actions/workflows/pages/pages-build-deployment/badge.svg?branch=main)](https://github.com/JBris/r-plumber-tutorials/actions/workflows/pages/pages-build-deployment)
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 Going through the tutorials for working with the Plumber package in R for developing web APIS: https://www.rplumber.io/