Added method to usage data such as credit utilization, number of logins etc. Will be used to get data from portal URL: https://<portal>.maps.arcgis.com/home/status/usage.html
Added method to usage data such as credit utilization, number of logins etc. Will be used to get data from portal URL: https://<portal>.maps.arcgis.com/home/status/usage.html

Signed-off-by: Aayush Kumar <b1d328f3db575eba1acfa3177b8eb7b85dc59751@Esri.com>

aayushkr/portalpy,aayushkr/portalpy