Update README.md

README.md

@@ -1,2 +1,28 @@
 # pod-restarter
-Restarts a specific Pod in Kubernetes
+Restarts some Pods in Kubernetes, selected by labels
+
+## Usage
+```
+-grace-period int
+      the duration in seconds before the object should be deleted. (default 30)
+-namespace string
+      specify the namespace of the pods (default "default")
+-selector string
+      label selector
+```
+
+## Example
+Delete all Pods in default Namespace
+```
+pod-restarter -namespace=default
+```
+Delete all Pods with label "app=nginx" in default Namespace
+```
+pod-restarter -namespace=default -selector="app=nginx"
+```
+
+## Library and reference
+- https://github.com/kubernetes/client-go
+- https://github.com/kubernetes/client-go/blob/master/examples/out-of-cluster-client-configuration/main.go
+- https://github.com/kubernetes/client-go/blob/master/examples/in-cluster-client-configuration/main.go
+