KEP-5073: add Release Signoff Checklist section

Author: aaron-prindle

keps/sig-api-machinery/5073-declarative-validation-with-validation-gen/README.md

@@ -1,5 +1,6 @@
 # KEP-5073: Declarative Validation of Kubernetes Native Types With validation-gen
 <!-- toc -->
+  - [Release Signoff Checklist](#release-signoff-checklist)
 - [KEP-5073: Declarative Validation of Kubernetes Native Types With validation-gen](#kep-5073-declarative-validation-of-kubernetes-native-types-with-validation-gen)
   - [Summary](#summary)
   - [Motivation](#motivation)
@@ -85,6 +86,45 @@
     - [&quot;New K8s Native APIs&quot; Design Partner For Declarative Validation in 1.34](#new-k8s-native-apis-design-partner-for-declarative-validation-in-134)
 <!-- /toc -->
 
+
+## Release Signoff Checklist
+
+<!--
+**ACTION REQUIRED:** In order to merge code into a release, there must be an
+issue in [kubernetes/enhancements] referencing this KEP and targeting a release
+milestone **before the [Enhancement Freeze](https://git.k8s.io/sig-release/releases)
+of the targeted release**.
+
+For enhancements that make changes to code or processes/procedures in core
+Kubernetes—i.e., [kubernetes/kubernetes], we require the following Release
+Signoff checklist to be completed.
+
+Check these off as they are completed for the Release Team to track. These
+checklist items _must_ be updated for the enhancement to be released.
+-->
+
+Items marked with (R) are required *prior to targeting to a milestone / release*.
+
+- [X] (R) Enhancement issue in release milestone, which links to KEP dir in [kubernetes/enhancements] (not the initial KEP PR)
+- [X] (R) KEP approvers have approved the KEP status as `implementable`
+- [X] (R) Design details are appropriately documented
+- [X] (R) Test plan is in place, giving consideration to SIG Architecture and SIG Testing input (including test refactors)
+  - [ ] e2e Tests for all Beta API Operations (endpoints)
+  - [X] (R) Ensure GA e2e tests meet requirements for [Conformance Tests](https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/conformance-tests.md) 
+  - [X] (R) Minimum Two Week Window for GA e2e tests to prove flake free
+- [X] (R) Graduation criteria is in place
+  - [X] (R) [all GA Endpoints](https://github.com/kubernetes/community/pull/1806) must be hit by [Conformance Tests](https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/conformance-tests.md) 
+- [X] (R) Production readiness review completed
+- [X] (R) Production readiness review approved
+- [ ] "Implementation History" section is up-to-date for milestone
+- [X] User-facing documentation has been created in [kubernetes/website], for publication to [kubernetes.io]
+- [ ] Supporting documentation—e.g., additional design documents, links to mailing list discussions/SIG meetings, relevant PRs/issues, release notes
+
+<!--
+**Note:** This checklist is iterative and should be reviewed and updated every time this enhancement is being considered for a milestone.
+-->
+
+
 # KEP-5073: Declarative Validation of Kubernetes Native Types With validation-gen
 
 ## Summary