update README.md

README.md

@@ -1,16 +1,23 @@
 # shadowsocks-rust-docker
+
 Docker deployment solution of [shadowsocks-rust](https://github.com/shadowsocks/shadowsocks-rust)
 
 # Usage
 
 ```bash
 git clone https://github.com/CaKrome/shadowsocks-rust-docker.git
 
+# Create a .env file
+cp .env.sample .env
+
+# Create a config.json file
+cp config.json.sample config.json
+
+# Now edit the .env file and config.json to the configuation you like. Note that both files must use the sample port.
+
 # Build the docker image
 docker compose build
 
-# Now edit the file config.json to the configuation you like and also port in docker-compose.yml if you changed the default port.
-
 # Bring the service up
 docker compose up -d
 ```