[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
2 files changed
tree: 670c19d0076d0217ff9a29c3f9eb985f81053f38
  1. api/
  2. app/
  3. pom.xml