Add resource for useContext (#5033)

* Update 100-context.md

This article help me  a lot to grab the idea about how the context is solving the problem of the prop drilling. I think beginner should start with this article to grasp the knowledge about the problem that trying to solve by the the context

* Update src/data/roadmaps/react/content/106-state-management/100-context.md

* Update src/data/roadmaps/react/content/106-state-management/100-context.md

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

src/data/roadmaps/react/content/106-state-management/100-context.md

@@ -6,5 +6,6 @@ In a typical React application, data is passed top-down (parent to child) via pr
 
 Visit the following resources to learn more:
 
+- [Basic useContext Guide](https://www.w3schools.com/react/react_usecontext.asp)
 - [Passing Data Deeply with Context](https://react.dev/learn/passing-data-deeply-with-context)
 - [State with useContext and useState/useReducer](https://www.robinwieruch.de/react-state-usereducer-usestate-usecontext/)