Translate README and CONTRIBUTING to Korean (#303)

* Create README.ko_kr.md

* Update README.ko_kr.md

* Update README.ko_kr.md

* Update README.ko_kr.md

* Update README.es.md

* Update README.pt_br.md

* Update README.zh_tw.md

* Update README.zh_tw.md

* Update README.zh_cn.md

* Update README.md

* Update README.ko_kr.md

* Korean README.md

* Korean Version of CONTRIBUTING.md

* Added Language Navigation

* Added Language Navigation

* Added Korean into Language Navigation

* Added Korean into Language Navigation

* Added Korean into Language Navigation

* Added Korean into Language Navigation

* Added Korean into Language Navigation

* Update CONTRIBUTING.ko_kr.md

* Changed to "Available in"

* Elaborated some translations

README.zh_cn.md

@@ -1,8 +1,8 @@
 # 阿波罗11号
 [![NASA][1]][2]
 
-*Available in: [English](README.md), [简体中文](README.zh_cn.md), [正體中文](README.zh_tw.md), [Português](README.pt_br.md), [Español](README.es.md)*
-
+*Available in: [English](README.md), [简体中文](README.zh_cn.md), [正體中文](README.zh_tw.md), [Português](README.pt_br.md), [Español](README.es.md), [한국어](README.ko_kr.md)*
+ 
 阿波罗11号制导计算机（AGC）中指令模块（Comanche055）和登月模块（Luminary099）原始代码。由[虚拟 AGC](http://www.ibiblio.org/apollo/) 和 [MIT 科学博物馆](http://web.mit.edu/museum/) 的伙计们完成电子化。本仓库的目的是存储阿波罗11号原始代码。当然，倘若在本仓库或原始代码扫描件[Luminary 099](http://www.ibiblio.org/apollo/ScansForConversion/Luminary099/) 及 [Comancheion 055](http://www.ibiblio.org/apollo/ScansForConversion/Comanche055/) 发现问题，或者任何我可能漏掉的文件，欢迎提交PRs。
 
 ## 编译