Update free-programming-books-tr.md

free-programming-books-tr.md

@@ -73,6 +73,7 @@
 * [Ruby Kullanıcı Kılavuzu](http://www.belgeler.org/uygulamalar/ruby/ruby-ug.html)
 * [Yirmi Dakikada Ruby](https://www.ruby-lang.org/tr/documentation/quickstart/)
 * [AB2014 Ruby Programlama Dili](https://github.com/leylaKapi/AB2014-Ruby-Programlama-Dili/blob/master/Ruby_AB2014.md)
+* [Ruby 101](https://www.gitbook.io/book/vigo/ruby-101)
 
 ### Rust
 * [Rust'a Giriş](http://bit.ly/rustagiris)