Add instructions for Chrome OS

README.md

@@ -23,7 +23,23 @@ A precompiled version is available at http://koti.kapsi.fi/~kliment/printrun/
 
 You can run Printrun directly from source, as there are no packages available yet. Fetch and install the dependencies using
 
-1. `sudo apt-get install python-serial python-wxgtk2.8 python-pyglet python-tornado python-setuptools python-libxml2 python-gobject avahi-daemon libavahi-compat-libdnssd1 python-dbus python-psutil`
+1. `sudo apt-get install python-serial python-wxgtk2.8 python-pyglet python-tornado python-setuptools python-libxml2 python-gobject avahi-daemon libavahi-compat-libdnssd1 python-dbus python-psutil git`
+
+Clone the repository
+
+`git clone https://github.com/kliment/Printrun.git`
+
+and you can start using Printrun from the Printrun directory created by the git clone command.
+
+### Chrome OS 
+
+You can use Printrun via crouton ( https://github.com/dnschneid/crouton ). Assuming you want Ubuntu Trusty, you used probably `sudo sh -e ~/Downloads/crouton -r trusty -t xfce` to install Ubuntu. Fetch and install dependencies with the line given above for Ubuntu/Debian, and obtain the source via git clone.
+
+By default you have no access to the serial port under Chrome OS, so you cannot connect to your 3D printer. Add yourself to the serial group to fix this
+
+`sudo usermod -G serial -a <username>` 
+
+where <username> should be your username. Log out and in to make this group change active and allow communication with your printer. 
 
 ### Fedora