[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/app/app.xml b/app/app.xml
index 8994bd6..b67486a 100644
--- a/app/app.xml
+++ b/app/app.xml
@@ -15,9 +15,11 @@
   ~ limitations under the License.
   -->
 <app name="org.onosproject.olt" origin="ON.Lab" version="${project.version}"
+     category="default" url="http://onosproject.org"
      featuresRepo="mvn:${project.groupId}/${project.artifactId}/${project.version}/xml/features"
      features="${project.artifactId}">
     <description>${project.description}</description>
+    <readme>OLT application for CORD.</readme>
     <artifact>mvn:${project.groupId}/${project.artifactId}/${project.version}</artifact>
     <artifact>mvn:${project.groupId}/onos-app-olt-api/${project.version}</artifact>
 </app>