Added zh_cn course file and a Golang course. (#5331)

* Added Golang course.

* Added a link for the Chinese courses in the readme.

* Removed old free courses-zh_cn.

* Added new interactive tutorials.

* Added extra line.

* Updated file path.

* Updated file path.

README.md

@@ -96,6 +96,7 @@ Please read [CONTRIBUTING](/CONTRIBUTING.md). If you're new to GitHub, [welcome]
 
 ### Interactive Programming Resources
 
++ [Chinese / 中文](more/free-programming-interactive-tutorials-zh.md)
 + [English](more/free-programming-interactive-tutorials-en.md)
 + [Russian / Русский язык](more/free-programming-interactive-tutorials-ru.md)
 

more/free-programming-interactive-tutorials-zh.md

+### Index
+
+* [Golang](#golang)
+
+
+### Golang
+
+* [Start using Go](https://docs.microsoft.com/zh-cn/learn/paths/go-first-steps/) - Microsoft
+