updated README + converted to markdown format.

README.md

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+AVS to BluRay SUP/PGS and BDN XML
+=================================
+
+This program can be used to transform AviSynth scripts, which produce RGBA
+output, to BDN XML+PNG format. This in turn can be transformed into a SUP file,
+which can be used to master a BluRay disc with subtitles.
+
+Usage instructions
+------------------
+
+0. If you want to build it:
+On Ubuntu:
+
+```
+sudo apt-get install mingw32 mingw32-binutils
+make
+```
+
+1. Prepare subtitles. You can either produce subtitles in a normal format like
+SRT or ASS/SSA, or produce an RGBA video beforehand.
+
+2. Create an AviSynth script. If you made a regular subtitle file, you can use
+something like this:
+
+```
+video=AviSource("video.avi")
+# This requires at least VSFilter 2.39
+MaskSub("subtitles.ext",video.width,video.height, video.framerate,video.framecount)
+```
+
+If you created an RGBA video, do something like this instead:
+
+```
+AviSource("subtitles_RGBA.avi")
+FlipVertical()
+```
+
+3. Run the program:
+
+```
+avs2bdnxml -t Undefined -l und -v 1080p -f 23.976 -a1 -p1 -b0 -m3 -u0 -e0 -n0 -z0 -o output.xml input.avs
+```
+
+4. You get a BDN XML file in the following format:
+
+```
+    <?xml version="1.0" encoding="UTF-8"?>
+    <BDN Version="0.93" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="BD-03-006-0093b BDN File Format.xsd">
+    <Description>
+    <Name Title="Undefined" Content=""/>
+    <Language Code="und"/>
+    <Format VideoFormat="[ 480i / 480p / 576i / 720p / 1080i /1080p ]" FrameRate="[ 23.976 / 24 / 25 / 29.97 / 50 / 59.94 ]" DropFrame="false"/>
+    <Events LastEventOutTC="00:00:00:00" FirstEventInTC="00:00:00:00" ContentInTC="00:00:00:00"
+    ContentOutTC="00:00:00:00" NumberofEvents="[ number of encoded frames ]" Type="Graphic"/>
+    </Description>
+    <Events>
+    <Event Forced="[ False / True ]" InTC="00:00:00:00" OutTC="00:00:00:00">
+    <Graphic Width="0" Height="0" X="0" Y="0">000000.png</Graphic>
+    </Event>
+    </Events>
+    </BDN>
+```
+
+5. To convert output directly to BD .sup format, simply change extension for output file in programm call to .sup.
+
+**Don't use BDSupEdit or BDSup2Sub if you enabled -b for splitting images in multiple parts!**
+
+
+Detail informations on [doom9](http://forum.doom9.org/showthread.php?t=146493)
+
+> http://ps-auxw.de/avs2bdnxml/