Merge pull request #3197 from embik/kubermatic-adopters-update

📖 Update Kubermatic adopter entry

ADOPTERS.md

@@ -5,5 +5,5 @@ Listed below are organizations that have adopted kcp in one way or another. We a
 
 | Organization  | Description | Maturity Level | Further Information |
 | ------------- | ------------- | --- | --- |
-| Kubermatic    | Kubermatic is building an internal developer platform (IdP) product that uses kcp as its global API control plane  | Development | - |
+| Kubermatic    | Kubermatic is building Kubermatic Developer Platform (KDP), an internal developer platform (IdP) product that uses kcp as its global API control plane.  | Development | [Product Website](https://www.kubermatic.com/products/kubermatic-developer-platform/) |
 | Faros.sh      | Faros is building a control-plane-as-a-service to access & manage multiple Kubernetes clusters across public and private deployments. | Development | - |