Add the instruction about how to use hd as a sidecar

Author: LinuxSuRen

hack/README.md

@@ -0,0 +1,5 @@
+Add as a sidecar:
+
+```shell
+kubectl patch deployment you-app -p'{"spec":{"template":{"spec":{"containers":[{"name":"hd","image":"ghcr.io/linuxsuren/hd","command":["/bin/sh"],"args":["-c","while true; do echo hello; sleep 10;done"]}]}}}}'
+```