Update CODEOWNERS to initialize vi l10n (#3460)

Signed-off-by: Junya Okabe <[email protected]>

Author: Okabe-Junya

CODEOWNERS

@@ -70,6 +70,10 @@
 /content/ur/ @Saim-Safdar @waleed318
 /i18n/ur.toml @Saim-Safdar @waleed318
 
+# Approvers for Vietnamese contents
+/content/vi/ @ntheanh201 @thuanpham582002
+/i18n/vi.toml @ntheanh201 @thuanpham582002
+
 # Approvers for Simplified Chinese contents
 /content/zh-cn/ @hanyuancheung @Jacob953 @Rocksnake @Submarinee
 /i18n/zh-cn.toml @hanyuancheung @Jacob953 @Rocksnake @Submarinee