added some basic installation instruction to readme.txt

readme.txt

@@ -3,7 +3,7 @@ OpenMW: A reimplementation of The Elder Scrolls III: Morrowind
 OpenMW is an attempt at recreating the engine for the popular role-playing game
 Morrowind by Bethesda Softworks. You need to own and install the original game for OpenMW to work.
 
-Version: 0.11
+Version: 0.11.1
 License: GPL (see GPL3.txt for more information)
 Website: http://www.openmw.org
 
@@ -13,11 +13,11 @@ THIS IS A WORK IN PROGRESS
 INSTALLATION
 
 Windows:
-TODO add description for Windows
+Just unpack to a location of your choice. Currently there is no installer.
 
 Linux:
-Ubuntu
-TODO add description for Ubuntu
+Ubuntu (and most others)
+Download the .deb file and install it in the usual way.
 
 Arch Linux
 There's an OpenMW package available in the AUR Repository:
@@ -30,6 +30,18 @@ BUILD FROM SOURCE
 
 TODO add description here
 
+THE DATA PATH
+
+After the installation OpenMW needs to be told where to find the Morrowind data directory. Create a text file named openmw.cfg (location depends on platform) and enter the following line:
+
+data=path to your data directory
+
+(where you replace "path to your data directory" with the actual location of your data directory)
+
+On Windows you a suitable location for the cfg file is alongside the binary. Currently the binary release comes with such a file pre-generated, but you still need to adjust the data setting.
+
+On Linux and Mac the default location will be ~/.config/openmw/openmw.cfg.
+
 COMMAND LINE OPTIONS
 TODO add description of command line options