Add toolkit diagram

README.md

@@ -1,12 +1,17 @@
 # toolkit
 
 [![e2e](https://github.com/fluxcd/toolkit/workflows/e2e/badge.svg)](https://github.com/fluxcd/toolkit/actions)
+[![report](https://goreportcard.com/badge/github.com/fluxcd/toolkit)](https://goreportcard.com/report/github.com/fluxcd/toolkit)
+[![license](https://img.shields.io/github/license/fluxcd/toolkit.svg)](https://github.com/fluxcd/toolkit/blob/master/LICENSE)
+[![release](https://img.shields.io/github/release/fluxcd/toolkit/all.svg)](https://github.com/fluxcd/toolkit/releases)
 
 Experimental toolkit for assembling CD pipelines the GitOps way.
 
+![overview](docs/diagrams/tk-overview.png)
+
 Components:
 * [Toolkit CLI](docs/cmd/tk.md)
 * [Source Controller](https://github.com/fluxcd/source-controller)
 * [Kustomize Controller](https://github.com/fluxcd/kustomize-controller)
 
-To install the toolkit CLI, see these [instructions](install/README.md).
+To install the toolkit CLI, follow the [instructions](install/README.md).