Update free-courses-tr.md (#9013)

* Update free-courses-tr.md

* Update courses/free-courses-tr.md

* Update courses/free-courses-tr.md

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

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

courses/free-courses-tr.md

@@ -1,6 +1,7 @@
 ### Index
 
 * [Algoritmalar](#algoritmalar)
+* [C#](#c-sharp)
 * [HTML and CSS](#html-and-css)
 * [IDE and editors](#ide-and-editors)
 * [Java](#java)
@@ -19,6 +20,11 @@
 * [On Derste Algoritma ve Programlama](https://www.youtube.com/playlist?list=PLKnjBHu2xXNNiJdlhiEl_RMkK0PbJ1_DB) - Murat Yücedağ
 
 
+### <a id='c-sharp'></a>C#
+
+* [C# Dersleri \| Visual Studio 2022 ile C# Programlama \| C# Giriş](https://www.youtube.com/playlist?list=PLi1BmHvgBkxIYweLR52cRJnit4AEEugn4) - Yazılım Teknolojileri Akademisi
+
+
 ### HTML and CSS
 
 * [Bootstrap Eğitim Serisi](https://youtube.com/playlist?list=PLGrTHqyRDvx5ZUs7h8mfGACFpnVipTNkA) - Hakan Yalçınkaya \| Kodluyoruz