Update doc

Author: mipsel64

README.md

@@ -1,3 +1,11 @@
 # Nginx Errors
 
-This is an additional ingres-nginx's default backend with custom error page.
+This is an additional ingress-nginx's default backend with custom error page.
+
+## Usage
+### Docker 
+```console
+$ docker pull vietanhs0817/nginx-errors:latest 
+
+$ docker run -p 8080:8080 vietanhs0817/nginx-errors:latest
+```