Update README

README.md

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 # docker-pv-resizer
 
-Docker image with a script to automatically resize PersistentVolumes in Kubernetes
+Docker image with a script to automatically resize PersistentVolumes in Kubernetes. It leverages kubectl df-pv plugin to get kubelet metrics for each volume. 
+
+Requires kubectl with a configuration file in ~/.kube/config and df-pv krew plugin.
+
+Usage:
+  ./check_full_pvs.sh [-t threshold] [-f]"
+  
+Parameters:
+  -t (optional) : Threshold to use for near full PV evaluation (in %). Defaults to 85%.
+  -f (optional) : Fix near full PVs (resize them). Defaults to false.
+  -i (optional) : Percentage of PV increase when resizing. Defaults to 50%.