update readme

README.md

@@ -73,6 +73,23 @@ your X server:
 xhost +SI:localuser:$(id -un)
 ```
 
+You can use the following alias:
+
+> add this to your ``~/.bash_alias`` file
+
+```sh
+function docker_helper_run() {
+  command cd ~/git/$1
+  docker-compose rm -f "$1"
+  docker-compose run -d --name "$1" "$@"
+  command cd ~-
+}
+
+function steam() {
+  docker_helper_run "$FUNCNAME" "$@"
+}
+```
+
 ## Troubleshooting
 
 You might want to modify the `docker-compose.yml` in case of problems,