Add Go/Rust/Ruby courses from learnxinyminutes (#7687)

Add Go/Rust/Ruby courses from learnxinyminutes

books/free-programming-books-langs.md

@@ -822,6 +822,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 * [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)
 * [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/)
 * [Learning Go](https://miek.nl/go/)
 * [Let's learn Go!](http://go-book.readthedocs.io/en/latest/)
@@ -2181,6 +2182,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 * [Introduction to Programming with Ruby](https://launchschool.com/books/ruby) - Launch School
 * [Just Enough Ruby to Get By](http://jasonkim.ca/projects/just_enough_ruby_to_get_by/)
 * [Learn Ruby First](https://essenceofchaos.gitbooks.io/learn-ruby-first/content/) - Frederick John
+* [Learn Ruby in Y minutes](https://learnxinyminutes.com/docs/ruby/)
 * [Learn Ruby the Hard Way](https://learnrubythehardway.org/book/) - Zed A. Shaw
 * [Learn to Program](http://pine.fm/LearnToProgram/) - Chris Pine
 * [Mastering Roda](https://fiachetti.gitlab.io/mastering-roda) - Federico Iachetti, Avdi Grimm, Jeremy Evans
@@ -2246,6 +2248,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 * [Easy Rust](https://dhghomon.github.io/easy_rust/) - David McLeod (HTML, PDF)
 * [From JavaScript to Rust ebook](https://github.com/wasmflow/node-to-rust/raw/HEAD/from-javascript-to-rust.pdf) - Jarrod Overson (PDF)
 * [Guide to Rustc Development](https://rustc-dev-guide.rust-lang.org)
+* [Learn Rust in Y minutes](https://learnxinyminutes.com/docs/rust/)
 * [Learn Rust With Entirely Too Many Linked Lists](https://rust-unofficial.github.io/too-many-lists) - Alexis Beingessner
 * [Learning Rust Ebook](https://riptutorial.com/Download/rust.pdf) - StackOverflow Contributors (PDF)
 * [Rust by Example](https://doc.rust-lang.org/stable/rust-by-example)