update README

README.md

@@ -1 +1,24 @@
-# ECS Service Reboot
+# ECS Service Reboot
+
+## Overview
+
+| Arguemment | Description | Default Value |
+| --- | --- | --- |
+| cluster | The ECS cluster to look for the service | The environment variable `CLUSTER` |
+| region | The region to look for the service in ecs | The environment variable `AWS_REGION` |
+| service | The ECS service to reboot | The environment variable `SERVICE` |
+
+## Installation
+
+```bash
+brew tap jmoney/aws
+brew install reboot-ecs-service
+```
+
+## Run Locally
+
+```bash
+go run cmd/cli/main.go -cluster dev -region us-east-1 -service my-service
+```
+
+Will reboot the service name `my-service` in the `dev cluster` running in the `us-east-1` region.