add pricing schema

configs/pricing_schema_pv_storageclass.csv

@@ -0,0 +1,2 @@
+EndTimestamp,InstanceID,Region,AssetClass,InstanceIDField,InstanceType,MarketPriceHourly,Version
+2019-04-17 23:34:22 UTC,storageClass0,,pv,spec.storageClassName,,0.1338,