Added building microservices with GO tutorial (#11753)

Co-authored-by: Godwin Odenigbo <godwintrav@gmail>

Author: godwintrav

courses/free-courses-en.md

@@ -799,6 +799,7 @@
 ### Go
 
 * [A Tour Of Go](https://tour.golang.org/welcome/1)
+* [Building Microservices with Go](https://www.youtube.com/playlist?list=PLmD8u-IFdreyh6EUfevBcbiuCKzFk0EW_)
 * [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
 * [Go Programming Language Tutorial](https://www.youtube.com/playlist?list=PLS1QulWo1RIaRoN4vQQCYHWDuubEU8Vij) - ProgrammingKnowledge