Added Golang Gin Web Framework to free-programming-books-langs.md (#10169)

* Added Effective go book in programming

* Added Golang Gin Web Framework to free-programming-books-langs.md

* Update free-programming-books-subjects.md

* Apply suggestions from code review

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

* Update free-programming-books-langs.md

---------

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

books/free-programming-books-langs.md

@@ -813,6 +813,7 @@ Books on general-purpose programming that don't focus on a specific language are
 * [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
+* [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)
 * [Go for Javascript Developers](https://github.com/bulim/go-for-javascript-developers)