added angular course in english (#4718)

free-courses-en.md

@@ -103,6 +103,7 @@
 
 ### Angular
 
+* [Angular 6 Tutorials](https://www.youtube.com/playlist?list=PLYxzS__5yYQlqCmHqDyW3yo5V79C7eaTe) - codedamn (YouTube)
 * [Angular Fast Crash Course](https://www.udemy.com/angular-fast-crash-course/) - Edwin Diaz, Coding Faculty Solutions (Udemy)
 * [Angular for Beginners](https://www.udemy.com/course/angular-for-beginners-course/) - Angular University (Udemy)
 * [Angular Tutorial For Beginners](https://www.youtube.com/playlist?list=PLC3y8-rFHvwhBRAgFinJR8KHIrCdTkZcZ) - Codevolution (YouTube)