docs: Added tested providers (#41)

Signed-off-by: Kostis Kapelonis <[email protected]>

docs/provider-status.md

@@ -1,3 +1,24 @@
 # Provider Status
 
-To be Written
+Several Service Mesh and Gateway solutions are already implementing
+the Gateway API. You can find a contributed list of known implementations at the [Gateway API website](https://gateway-api.sigs.k8s.io/implementations/).
+
+All providers should work out of the box with Argo Rollouts and the Gateway plugin.
+
+For convenience we are including here a list of those actually tested with the plugin along with the related example (if applicable).
+
+
+| Provider   |    Works | Code |
+|------------|----------|---------|
+| [Cilium](https://cilium.io/)     | yes      | [Example](https://github.com/argoproj-labs/rollouts-plugin-trafficrouter-gatewayapi/tree/main/examples/cilium)    |
+| [Envoy Gateway](https://gateway.envoyproxy.io/)     | yes      | [Example](https://github.com/argoproj-labs/rollouts-plugin-trafficrouter-gatewayapi/tree/main/examples/envoygateway)    |
+| [Gloo Gateway](https://docs.solo.io/gloo-gateway/v2/)     | yes      | [Example](https://github.com/argoproj-labs/rollouts-plugin-trafficrouter-gatewayapi/tree/main/examples/gloo-gateway)    |
+| [Google Cloud](https://cloud.google.com/kubernetes-engine/docs/concepts/gateway-api)     | yes      | [Example](https://github.com/argoproj-labs/rollouts-plugin-trafficrouter-gatewayapi/tree/main/examples/google-cloud)    |
+| [Kong](https://docs.konghq.com/kubernetes-ingress-controller/latest/concepts/gateway-api/)     | yes      | [Example](https://github.com/argoproj-labs/rollouts-plugin-trafficrouter-gatewayapi/tree/main/examples/kong)    |
+| [NGINX Gateway](https://github.com/nginxinc/nginx-gateway-fabric)     | yes      | [Example](https://github.com/argoproj-labs/rollouts-plugin-trafficrouter-gatewayapi/tree/main/examples/nginx)    |
+| [Traefik](https://doc.traefik.io/traefik/providers/kubernetes-gateway/)     | yes      | [Example](https://github.com/argoproj-labs/rollouts-plugin-trafficrouter-gatewayapi/tree/main/examples/traefik)    |
+
+
+
+!!! note
+    We are always looking for more tested implementations. If you have tried the plugin with a provider not listed above please [open a Pull Request](https://github.com/argoproj-labs/rollouts-plugin-trafficrouter-gatewayapi/pulls) to add it to the list.