update Alibaba Cloud ECI Docs (#362)

README.md

@@ -19,6 +19,7 @@ The best description is "Kubernetes API on top, programmable back."
 * [How It Works](#how-it-works)
 * [Usage](#usage)
 * [Providers](#providers)
+    + [Alibaba Cloud ECI Provider](#alibaba-cloud-eci-provider)
     + [Azure Container Instances Provider](#azure-container-instances-provider)
 	+ [Azure Batch GPU Provider](./providers/azurebatch/README.md)
     + [AWS Fargate Provider](#aws-fargate-provider)
@@ -104,6 +105,18 @@ Providers must provide the following functionality to be considered a supported
 3. Does not have access to the Kubernetes API Server and has a well-defined callback mechanism for getting data like secrets or configmaps.
 
 
+### Alibaba Cloud ECI Provider
+
+Alibaba Cloud ECI(Elastic Container Instance) is a service that allow you run containers without having to manage servers or clusters.
+
+You can find more details in the [Alibaba Cloud ECI provider documentation](./providers/alicloud/README.md).
+
+#### Configuration File
+
+The alibaba ECI provider will read configuration file specified by the `--provider-config` flag.
+
+The example configure file is `providers/alicloud/eci.toml`.
+
 ### Azure Container Instances Provider
 
 The Azure Container Instances Provider allows you to utilize both