Update free-programming-books-langs.md (#8762)

* Update free-programming-books-langs.md

* Update free-programming-books-langs.md

* Update free-programming-books-langs.md

* Update books/free-programming-books-langs.md

Adding author

Co-authored-by: Sharan J <50091666+shrn01@users.noreply.github.com>

Co-authored-by: Sharan J <50091666+shrn01@users.noreply.github.com>

books/free-programming-books-langs.md

@@ -1297,6 +1297,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 
 #### React
 
+* [30 days of React: An introduction to React in 30 bite-size morsels](https://www.newline.co/fullstack-react/assets/media/sGEMe/MNzue/30-days-of-react-ebook-fullstackio.pdf) - Ari Lerner (PDF)
 * [Airbnb React/JSX Style Guide](https://airbnb.io/javascript/react/) - Airbnb
 * [Essential React](https://www.programming-books.io/essential/react/) - Krzysztof Kowalczyk, StackOverflow Contributors
 * [Hacking with React](http://www.hackingwithreact.com)