add golang video crash course (#7185)

* add golang video crash course

* Update courses/free-courses-en.md

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

courses/free-courses-en.md

@@ -435,6 +435,7 @@
 
 * [A Tour Of Go](https://tour.golang.org/welcome/1)
 * [DevOps BootCamp](https://github.com/jeffotoni/goworkshopdevops) - Jefferson Otoni Lima, et al.
+* [Go / Golang Crash Course](https://www.youtube.com/watch?v=SqrbIlUwR0U) - Traversy Media
 * [Golang \| Gin HTTP Framework](https://www.youtube.com/playlist?list=PL3eAkoh7fypr8zrkiygiY1e9osoqjoV9w) - Pragmatic Reviews
 * [Golang basics](https://www.youtube.com/playlist?list=PLve39GJ2D71xX0Ham0WoPaYfl8oTzZfN6) - Golang dojo
 * [Golang in under an hour](https://www.youtube.com/watch?v=N0fIANJkwic) - Eli Goldberg