Add content to useContext hook (#2592)

content/roadmaps/103-react/content/100-react-fundamental-topics/108-basic-hooks/102-use-context.md

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+# useContext Hook
+
+`useContext` hook is used to read and subscribe to context from your component. Context allows a parent component to pass data down the entire component tree below it.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='blue' badgeText='Official Docs' href='https://beta.reactjs.org/apis/react/useContext'>Using the Context Hook</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=5LrDIWkK_Bc'>Learn useContext in 13 Minutes</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.robinwieruch.de/react-usecontext-hook'>How to useContext in React</BadgeLink>