update README

README.md

@@ -1,19 +1,32 @@
 # ecsceed
 
-ECS deployment tool
+ECS config base deployment tool.  
+Inspired [ecspresso](https://github.com/kayac/ecspresso) and [kustomize](https://github.com/kubernetes-sigs/kustomize).
+
+It features: 
+* Override base config. (mainly for multi stage)
+* Extend Task definition. (e.g. cut out common between web server and worker)
 
 **WIP**
 
-## Sketch
+## Example
+
+See [test_files/example1](test_files/example1)
+
+## Install
+
+TODO
+
+## Usage
 
 ### Deploy
 
 ```bash
-ecsceed deploy -c config.yml -p ImageTag=$(git rev-parse HEAD)
+ecsceed deploy -c overlays/develop/config.yml -p ImageTag=$(git rev-parse HEAD)
 ```
 
 ### Exec
 
 ```bash
-ecsceed exec api echo test
+ecsceed exec -c overlays/develop/config.yml api echo test
 ```