cmctl: add page (#8230)

pages/common/cmctl.md

@@ -0,0 +1,21 @@
+# cmctl
+
+> A CLI tool that can help you to manage cert-manager resources inside your cluster.
+> Check cert signing status, approve/deny requests, and issue new certificate requests.
+> More information: <https://cert-manager.io/docs/usage/cmctl/>.
+
+- Check if the cert-manager API is ready:
+
+`cmctl check api`
+
+- Check the status of a certificate:
+
+`cmctl status certificate {{cert_name}}`
+
+- Create a new certificate request based on an existing certificate:
+
+`cmctl create certificaterequest my-cr --from-certificate-file {{cert.yaml}}`
+
+- Create a new certificate request, fetch the signed certificate, and set a maximum wait time:
+
+`cmctl create certificaterequest my-cr --from-certificate-file {{cert.yaml}} --fetch-certificate --timeout {{20m}}`