add golangbot golang effective tutorial (#10319)

* add golang golangbot effective tutorial

* Update author and title

Co-authored-by: Eric Hellman <eric@hellman.net>

---------

Co-authored-by: Eric Hellman <eric@hellman.net>

books/free-programming-books-langs.md

@@ -825,6 +825,7 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Go Tutorial](http://www.tutorialspoint.com/go/) - Tutorials Point (HTML, PDF)
 * [Go Web Development Succinctly](https://www.syncfusion.com/succinctly-free-ebooks/go-web-development) - Mark Lewin (PDF, EPUB, Kindle)
 * [Golang by Example](https://golangbyexample.com)
+* [Golang tutorial series](https://golangbot.com/learn-golang-series/) - Naveen Ramanathan
 * [How To Code in Go](https://www.digitalocean.com/community/books/how-to-code-in-go-ebook) - Mark Bates, Cory Lanou, Timothy J. Raymond (PDF, EPUB)
 * [Learn Go in Y minutes](https://learnxinyminutes.com/docs/go/)
 * [Learn Go with Tests](https://quii.gitbook.io/learn-go-with-tests/) - Chris James