Add Vietnamese translation

README.md

@@ -38,6 +38,7 @@ if you need some help getting it setup.
 * [Traditional Chinese/正體中文](https://www.sqlstyle.guide/zh-tw/) by [Leon0824](https://github.com/Leon0824)
 * [Turkish/Türkçe](https://www.sqlstyle.guide/tr/) by [mrfade](https://github.com/mrfade)
 * [Ukrainian/Українська](https://www.sqlstyle.guide/ua/) by [yar-lukomsky](https://github.com/yar-lukomsky)
+* [Vietnamese/Tiếng Việt](https://www.sqlstyle.guide/vn/) by [Vũ Phượng Hoàng](https://github.com/DancingPhoenix88)
 
 ## Projects known to be implementing the guide
 

_config.yml

@@ -62,3 +62,6 @@ langs:
     ua:
         ua: Українська
         en: Ukrainian
+    vn:
+        vn: Tiếng Việt
+        en: Vietnamese

vn/index.md

@@ -0,0 +1,13 @@
+---
+layout: default
+lang: vn
+lang_title: Bộ quy tắc viết SQL
+contributors:
+    - user: Vũ Phượng Hoàng
+      type: translator
+---
+
+* MỤC LỤC
+{:toc}
+
+{% include sqlstyle.guide.vn.md %}