Add content for Radix UI (#6308)

* update radix-ui@XL9XOV2h0BAuA5cFcM5L_.md

* Update src/data/roadmaps/react/content/radix-ui@XL9XOV2h0BAuA5cFcM5L_.md

* Update src/data/roadmaps/react/content/radix-ui@XL9XOV2h0BAuA5cFcM5L_.md

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Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

src/data/roadmaps/react/content/radix-ui@XL9XOV2h0BAuA5cFcM5L_.md

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 # Radix UI
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+Radix UI is an open-source library designed to make it easier to create accessible and customizable User Interface (UI) components in React. It provides developers with a range of `unstyled`, fully `accessible` primitives, giving them complete control over the appearance and behavior of their UI elements.
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+Visit the following resources to learn more:
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+- [@official@Getting Started with Radix UI](https://www.radix-ui.com/themes/docs/overview/getting-started)
+- [@official@Official Website](https://www.radix-ui.com/)
+- [@video@Radix UI Course](https://www.youtube.com/playlist?list=PLlNdnoKwDZdwANQoaakE8-kYMyKFOETlo)
+- [@article@What is Radix UI?](https://medium.com/@olivier.trinh/what-is-radix-ui-ff535bbb52d5)
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