Define TLS options on the Router configuration for Kubernetes

Co-authored-by: juliens <julien@containo.us>

docs/content/middlewares/overview.md

@@ -71,6 +71,38 @@ labels:
   - "traefik.http.middlewares.foo-add-prefix.addprefix.prefix=/foo"
 ```
 
+```toml tab="File"
+[tlsOptions]
+    [tlsOptions.default]
+        minVersion = "VersionTLS12"
+```
+
+```yaml tab="Kubernetes"
+apiVersion: apiextensions.k8s.io/v1beta1
+kind: CustomResourceDefinition
+metadata:
+  name: tlsoptions.traefik.containo.us
+
+spec:
+  group: traefik.containo.us
+  version: v1alpha1
+  names:
+    kind: TLSOption
+    plural: tlsoptions
+    singular: tlsoption
+  scope: Namespaced
+
+---
+apiVersion: traefik.containo.us/v1alpha1
+kind: TLSOption
+metadata:
+  name: mytlsoption
+  namespace: default
+
+spec:
+  minversion: VersionTLS12
+```
+
 ```toml tab="File"
 # As Toml Configuration File
 [providers]