[zh] Add zh text to: security-context.md

Author: windsonsea

content/zh-cn/docs/reference/command-line-tools-reference/feature-gates/supplemental-groups-policy.md

@@ -0,0 +1,19 @@
+---
+title: SupplementalGroupsPolicy
+content_type: feature_gate
+_build:
+  list: never
+  render: false
+
+stages:
+  - stage: alpha
+    defaultValue: false
+    fromVersion: "1.31"
+---
+
+<!--
+Enables support for fine-grained SupplementalGroups control.
+For more details, see [Configure fine-grained SupplementalGroups control for a Pod](/content/en/docs/tasks/configure-pod-container/security-context/#supplementalgroupspolicy).
+-->
+启用对细粒度 SupplementalGroups 控制的支持。
+有关细节请参见[为 Pod 配置细粒度 SupplementalGroups 控制](/zh-cn/docs/tasks/configure-pod-container/security-context/#supplementalgroupspolicy)。