[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/events/pom.xml b/apps/events/pom.xml
index 8415e92..f5ab42d 100644
--- a/apps/events/pom.xml
+++ b/apps/events/pom.xml
@@ -34,6 +34,10 @@
     <properties>
         <onos.version>1.5.0-SNAPSHOT</onos.version>
         <onos.app.name>org.onosproject.events</onos.app.name>
+        <onos.app.category>default</onos.app.category>
+        <onos.app.url>http://onosproject.org</onos.app.url>
+        <onos.app.readme>ONOS event history display application.
+        </onos.app.readme>
     </properties>
 
     <dependencies>