React component/libraries content added (#6693)

* React component/libraries content added

* Update src/data/roadmaps/react/content/component--libraries@thfnymb_UIiKxakKfiua5.md

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

src/data/roadmaps/react/content/component--libraries@thfnymb_UIiKxakKfiua5.md

@@ -1 +1,3 @@
-# Component / Libraries
+# Component / Libraries
+
+React component libraries are collections of pre-built, reusable components that can be used to speed up the development process. They can be styled using CSS in various ways, including traditional CSS files, CSS modules, and CSS-in-JS solutions like styled-components.