kubectl-certificate: add page (#19135)

Author: lukasz-c24

pages/common/kubectl-certificate.md

@@ -0,0 +1,24 @@
+# kubectl certificate
+
+> Manage certificate signing requests.
+> More information: <https://kubernetes.io/docs/reference/kubectl/generated/kubectl_certificate>.
+
+- Approve a certificate signing request by name:
+
+`kubectl certificate approve {{csr_name}}`
+
+- Deny a certificate signing request by name:
+
+`kubectl certificate deny {{csr_name}}`
+
+- Approve a certificate signing request defined in a manifest file:
+
+`kubectl certificate approve --filename {{path/to/csr.yaml}}`
+
+- Deny a certificate signing request defined in a manifest file:
+
+`kubectl certificate deny --filename {{path/to/csr.yaml}}`
+
+- Force reapproval of a certificate signing request that was previously denied:
+
+`kubectl certificate approve --force {{csr_name}}`