Added PodLifecycleSleepActionAllowZero feature gate

Author: sreeram-venkitesh

content/en/docs/reference/command-line-tools-reference/feature-gates/pod-lifecycle-sleep-action-allow-zero.md

@@ -0,0 +1,14 @@
+---
+title: PodLifecycleSleepActionAllowZero
+content_type: feature_gate
+_build:
+  list: never
+  render: false
+
+stages:
+  - stage: alpha 
+    defaultValue: false
+    fromVersion: "1.32"
+    toVersion: "1.32"
+---
+Enables setting zero value for the `sleep` action in Container lifecycle hooks.