[ONOS-3634] Enhance app to have a category, icon, URL and readme

This commmit enhances application to have category, icon, URL and
readme. The web GUI and CLI will be implemented in separate commits

Change-Id: Ib02716d7118cc617b24f196f2213ea1fe99a34be
diff --git a/apps/vtn/vtnweb/pom.xml b/apps/vtn/vtnweb/pom.xml
index b448b35..fdbfe00 100644
--- a/apps/vtn/vtnweb/pom.xml
+++ b/apps/vtn/vtnweb/pom.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 <!--
   ~ Copyright 2015 Open Networking Laboratory
   ~