feat: add ecs in plugins section

Signed-off-by: Hoang Ngo <adlehoang118@gmail.com>

Author: armistcxy

docs/content/en/docs-v1.0.x/plugins/_index.md

@@ -12,6 +12,8 @@ description: >
 | Plugin | Description | Status |
 |--------|-------------|--------|
 | [Kubernetes multi-cluster](kubernetes-multicluster/) | Deploy a single application to multiple Kubernetes clusters with one pipeline. | Alpha |
+| [ECS](ecs/) | Deploy applications to Amazon ECS using the `EXTERNAL` deployment controller | Alpha |
+
 In PipeCD v1, plugins handle deployments. `piped` runs each configured plugin as a separate process and communicates with it over gRPC, so which platforms your `piped` can deploy to depends on which plugins you configure. See more about [plugins](../concepts/#plugins).
 
 There are two types of plugins: