Update README.md

Author: SamuelTallet

docs/README.md

@@ -18,7 +18,7 @@ Installation
 ------------
 
 ### Docker (PHP built-in server)
-1. Run `docker pull samueltallet/mongodb-php-gui`.<br>
+1. Run `docker run -p 5000:5000 samueltallet/mongodb-php-gui`.<br>
 2. Open your browser at this address: http://127.0.0.1:5000/ to access GUI.<br>
 3. If your MongoDB is running on localhost, use 172.17.0.1 as host to login.