add resource GO free ebook (#5609)

* Update free-programming-books-id.md

add golang  indonesia language free ebook link

* Update free-programming-books-id.md

add resource GO free ebook

books/free-programming-books-id.md

@@ -63,6 +63,7 @@
 
 * [Belajar Dengan Jenius Golang](https://raw.githubusercontent.com/gungunfebrianza/Belajar-Dengan-Jenius-Golang/master/Belajar%20Dengan%20Jenius%20Golang.pdf) - Gun Gun Febrianza (PDF)
 * [Dasar Pemrograman Golang](https://dasarpemrogramangolang.novalagung.com) - Noval Agung Prayogo
+* [Mari Belajar Golang](https://www.smashwords.com/books/view/938003) - Risal (PDF)
 
 
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