CLDR-18250 Create en_VN.xml

en-VN appears to follow US formatting, the only thing that may differ is the short date format which will need more investigation.

Author: AEApple

common/main/en_VN.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
+<!-- Copyright © 1991-2025 Unicode, Inc.
+For terms of use, see http://www.unicode.org/copyright.html
+SPDX-License-Identifier: Unicode-3.0
+CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)
+-->
+<ldml>
+	<identity>
+		<version number="$Revision$"/>
+		<language type="en"/>
+		<territory type="VN"/>
+	</identity>
+</ldml>