added free udemy course for git and github (#9688)

courses/free-courses-en.md

@@ -660,6 +660,7 @@
 * [Git](https://www.youtube.com/playlist?list=PLFBirL3MAv29Vy_L7MmV2QaZLvAadFPHR) - Gwendolyn Faraday
 * [Git & GitHub](https://www.youtube.com/playlist?list=PLWKjhJtqVAbkFiqHnNaxpOPhh9tSWMXIF) - Briana Marie, freeCodeCamp.org
 * [Git & GitHub](https://www.youtube.com/playlist?list=PLhW3qG5bs-L8OlICbNX9u4MZ3rAt5c5GG) - Raghav Pal, Automation Step by Step
+* [Git & GitHub Complete Guide](https://www.udemy.com/course/git-n-github-complete-guide) (Udemy)
 * [Git & GitHub Crash Course](https://www.udemy.com/course/git-and-github-crash-course-creating-a-repository-from-scratch/) - Kalob Taulien (Udemy)
 * [Git & GitHub Tutorial for Beginners](https://www.youtube.com/playlist?list=PL4cUxeGkcC9goXbgTDQ0n_4TBzOO0ocPR) (The Net Ninja)
 * [Git and GitHub for Poets](https://www.youtube.com/playlist?list=PLRqwX-V7Uu6ZF9C0YMKuns9sLDzK6zoiV)