Add license tags to Go Books (#11472)

Author: azamshaikh1103

Diff for: books/free-programming-books-langs.md

@@ -807,12 +807,12 @@ Books on general-purpose programming that don't focus on a specific language are
 ### Go
 
 * [An Introduction to Programming in Go](https://www.golang-book.com/books/intro) - Caleb Doxsey
-* [Build Web Application with Golang](https://astaxie.gitbooks.io/build-web-application-with-golang/content/en/) - astaxie
+* [Build Web Application with Golang](https://astaxie.gitbooks.io/build-web-application-with-golang/content/en/) - astaxie (CC BY-SA)
 * [Building Web Apps with Go](https://codegangsta.gitbooks.io/building-web-apps-with-go/content/)
 * [Darker Corners of Go](https://rytisbiel.com/2021/03/06/darker-corners-of-go/) - Rytis Bieliunas
 * [Effective Go](https://golang.org/doc/effective_go.html)
-* [Essential Go](https://www.programming-books.io/essential/go/) - Krzysztof Kowalczyk, StackOverflow Contributors
-* [Essentials of Go Programming](https://essentials-of-go-programming.readthedocs.io) - Baiju Muthukadan (HTML)
+* [Essential Go](https://www.programming-books.io/essential/go/) - Krzysztof Kowalczyk, StackOverflow Contributors (CC BY-SA)
+* [Essentials of Go Programming](https://essentials-of-go-programming.readthedocs.io) - Baiju Muthukadan (HTML) (CC BY-SA)
 * [Gin Web Framework](https://chenyitian.gitbooks.io/gin-web-framework/content/)
 * [Go 101](https://go101.org/article/101.html) - [@TapirLiu](https://twitter.com/TapirLiu)
 * [Go by Example](https://gobyexample.com)
@@ -834,8 +834,8 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Practical Go: Real world advice for writing maintainable Go programs](https://dave.cheney.net/practical-go/presentations/qcon-china.html) - Dave Cheney (HTML)
 * [Production Go](https://leanpub.com/productiongo/read) - Herman Schaaf and Shawn Smith (EPUB, HTML, PDF) (:construction: *in process*) *(Leanpub account or valid email requested for EPUB or PDF)*
 * [The Go Tutorial](http://tour.golang.org)
-* [The Little Go Book](https://github.com/karlseguin/the-little-go-book) - Karl Seguin ([PDF](https://www.openmymind.net/assets/go/go.pdf), [ePUB](https://www.openmymind.net/assets/go/go.epub))
-* [Web apps in Go, the anti textbook](https://github.com/thewhitetulip/web-dev-golang-anti-textbook/)
+* [The Little Go Book](https://github.com/karlseguin/the-little-go-book) - Karl Seguin ([PDF](https://www.openmymind.net/assets/go/go.pdf), [ePUB](https://www.openmymind.net/assets/go/go.epub)) (CC BY-NC-SA)
+* [Web apps in Go, the anti textbook](https://github.com/thewhitetulip/web-dev-golang-anti-textbook/) (CC BY-SA)
 
 
 ### Graphs