Add author for Git 101 (#2727)

free-programming-books-tr.md

@@ -63,7 +63,7 @@
 ### Git
 
 * [git - basit rehber](http://rogerdudler.github.io/git-guide/index.tr.html)
-* [Git 101](https://www.gitbook.com/book/aliozgur/git101/details)
+* [Git 101](https://www.gitbook.com/book/aliozgur/git101/details) by [Ali Özgür](https://github.com/aliozgur)
 
 
 ### Go