rename example folder, add diagram

examples/gke-serverless/README.md

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+# GKE and Serverless examples
+
+The examples in this folder show implement **end-to-end scenarios** for GKE or Serveless topologies that show how to automate common configurations or leverage specific products.
+
+They are meant to be used as minimal but complete starting points to create actual infrastructure, and as playgrounds to experiment with Google Cloud features.
+
+## Examples
+
+### Multitenant GKE fleet
+
+<a href="./multitenant-fleet/" title="GKE multitenant fleet"><img src="./multitenant-fleet/diagram.png" align="left" width="280px"></a> This [example](./multitenant-fleet/) allows simple centralized management of similar sets of GKE clusters and their nodepools in a single project, and optional fleet management via GKE Hub templated configurations.
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examples/gke-serverless/multitenant-fleet/README.md

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 TODO: add brief explanation and refer back to dev folder?
 
+<p align="center">
+  <img src="diagram.png" alt="GKE multitenant">
+</p>
+
 This is an example of that shows the use of the above variables:
 
 ```hcl