updated readme to contain hint for os x users in order to start docker host

Author: janniclas

README.md

@@ -22,9 +22,15 @@ It takes commands from authenticated administrators over the web interface and i
 To build the angular app for deployment make sure to have npm and the angular cli installed 
 ```
 cd client && npm install && ng build --prod && cd ..
+
+For OS X users you need to expose the TCP port manually. The docker FAQ suggest it in this way:
+```
+docker run -d -v /var/run/docker.sock:/var/run/docker.sock -p 127.0.0.1:1234:1234 bobrik/socat TCP-LISTEN:1234,fork UNIX-CONNECT:/var/run/docker.sock
 ```
+
 For any deployed instance you need an administrator account to interact with the application.
 You can start your own instance by executing
+
 ```
 sbt run
 ```