The fakeclient package does not have any non-test go files. This
causes `go build` to give a warning: `no non-test Go files in ...`.
This also causes the publishing bot to fail.
This PR adds a dummy doc.go file in the package to avoid this warning.
Kubernetes-commit: 764ae69671428987d77898b2d3c48c6c003e2fd4
This adds an example showing the steps needed to get a working
SharedInformerFactory with a fake client for testing.
Kubernetes-commit: aed487b42d1b49df9ac01f7234896f6d1b4da166