Add Consul Catalog provider

docs/content/middlewares/overview.md

@@ -63,6 +63,13 @@ spec:
       - name: stripprefix
 ```
 
+```yaml tab="Consul Catalog"
+# Create a middleware named `foo-add-prefix`
+- "traefik.http.middlewares.foo-add-prefix.addprefix.prefix=/foo"
+# Apply the middleware named `foo-add-prefix` to the router named `router1`
+- "traefik.http.routers.router1.middlewares=foo-add-prefix@consulcatalog"
+```
+
 ```json tab="Marathon"
 "labels": {
   "traefik.http.middlewares.foo-add-prefix.addprefix.prefix": "/foo",