Added Introduction to React from Full stack open and Learn React Router 6 from Scrimba courses (#10731)

courses/free-courses-en.md

@@ -1034,8 +1034,10 @@
 * [Full Modern React Tutorial](https://www.youtube.com/playlist?list=PL4cUxeGkcC9gZD-Tvwfod2gaISzfRiP9d) - The Net Ninja (with practical)
 * [Full-Stack Web Development with React Specialization](https://www.coursera.org/specializations/full-stack-react) - Jogesh K. Muppala (Coursera)
 * [Full Stack with React and Appwrite](https://egghead.io/playlists/full-stack-with-react-and-appwrite-e1e46f61) - Colby Fayock (Egghead.io)
+* [Introduction to React](https://fullstackopen.com/en/part1/introduction_to_react) - Full Stack open
 * [Learn React + Redux](https://www.sololearn.com/learning/1097) - *registration required*
 * [Learn React for Free](https://scrimba.com/learn/learnreact) - Bob Ziroll (scrimba)
+* [Learn React Router 6](https://scrimba.com/learn/reactrouter6) - Bob Ziroll (scrimba)
 * [Learn ReactJS](https://www.codecademy.com/learn/react-101) - Codecademy
 * [React](https://progate.com/languages/react) (progate) *(account required)*
 * [React basic in just 1 hour](https://www.udemy.com/course/react-basic-in-just-1-hour/) (Udemy)