update README

README.md

@@ -8,6 +8,13 @@
 docker-compose run --rm tor
 ```
 
+You can use the following shortcut function and place it to your `~/.bash_aliases` file
+
+```
+function docker_helper() { (cd ~/docker/$1; docker-compose run --rm "$@" & disown) }
+function tor() { (docker_helper $FUNCNAME $@) }
+```
+
 ### with Docker
 
 ```