Add Packet to adopters list

ADOPTERS.md

@@ -19,6 +19,13 @@ Their clients run all kinds of workloads on top of Gardener maintained
 Kubernetes clusters ranging from databases to Software as a Service
 applications.
 
+Cloud provider adopters
+
+- [Packet](https://packet.com) drove and sponsored integration of Gardener into its
+bare-metal cloud platform. Packet customers now are able to manage multiple Kubernetes
+clusters with ease everywhere that Packet is available: across regions, at the edge
+in telco networks, and on customer premises.
+
 Adopters in evaluation or pre-production phase
 
 - [Finanz Informatik Technologie Services GmbH]( https://f-i-ts.de/ )
@@ -28,4 +35,4 @@ infrastructure implemented from scratch for k8s workloads in mind.
 The result is k8s on top of bare metal in minutes.
 
 If you’re using Gardener and aren’t on this list, feel free to
-[submit a pull request](https://github.com/gardener/gardener/pulls)!
+[submit a pull request](https://github.com/gardener/gardener/pulls)!