Improve README

Author: Arnaud RITTI

README.md

@@ -25,6 +25,12 @@ Use it locally with Docker
 docker run --rm -p 80:80 arnaudritti/devtools
 ```
 
+#### Environement variables
+
+| Name | default value | options |
+| APP_ENV | `prod` | `prod`, `dev` |
+| BUCKET_MODE | `path` | `path`, `sudomain`, `both`|
+
 Or use the hosted service at [https://devtools.arnaud-ritti.fr/](https://devtools.arnaud-ritti.fr/)
 
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