Add a custom controller example

docs/catalog.md

@@ -2,4 +2,6 @@
 
 This is a non-comprehensive list of existing ingress controllers.
 
+* [Dummy controller backend](/examples/custom-controller)
+
 

docs/dev/devel.md

@@ -1,3 +1,4 @@
 # Writing Ingress controllers
 
 This doc outlines the basic steps needed to write an Ingress controller.
+If you want the tl;dr version, skip straight to the [example](/examples/custom-controller).

docs/faq/README.md

@@ -85,7 +85,7 @@ as well as in [this](/examples/pipeline) example.
 
 First check the [catalog](#is-there-a-catalog-of-existing-ingress-controllers), to make sure you really need to write one.
 
-1. Write a [generic backend](https://github.com/kubernetes/ingress/blob/master/core/pkg/ingress/doc.go)
+1. Write a [generic backend](/examples/custom-controller)
 2. Keep it in your own repo, make sure it passes the [conformance suite](https://github.com/kubernetes/kubernetes/blob/master/test/e2e/ingress_utils.go#L112)
 3. Submit an example(s) in the appropriate subdirectories [here](/examples/README.md)
 4. Add it to the catalog