add setting up Tailwind CSS

Author: solygambas

playground/tailwind-jit/README.md

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+# Tailwind Just in Time
+
+A quick intro to Tailwind Just in Time compiler.
+
+## Features
+
+- setting up Tailwind CSS with npx commands.
+- generating on-demand CSS with Tailwind for better performance during development.
+
+Based on [Tailwind Just in Time Tutorial](https://www.youtube.com/playlist?list=PL4cUxeGkcC9ht1OMQPhBVKAb2dVLhg-MJ) by Shaun Pelling - The Net Ninja (2021).