Update LOCAL_SETUP.md ( Make docker daemon useable without sudo )

LOCAL_SETUP.md

@@ -22,6 +22,14 @@ vagrant ssh
 sudo apt-get install nginx  
 sudo ln -s /etc/nginx/sites-available/code_ocean /etc/nginx/sites-enabled  
 
+### Make docker daemon useable without sudo
+# Infos taken from: http://askubuntu.com/questions/477551/how-can-i-use-docker-without-sudo
+
+sudo groupadd docker
+sudo gpasswd -a ${USER} docker
+sudo service docker restart
+newgrp docker
+
 ### Start server
 vagrant ssh  
 cd /vagrant