Updated readme

README.md

@@ -1,9 +1,46 @@
 DisUnity
-=========
+========
 
-An experimental command-line toolset for Unity asset and asset bundle files, mostly designed for extraction.
+An experimental command-line toolset for Unity asset and asset bundle files written in Java, mostly designed for extraction.
 
-Download
---------
+### Download
 
 The latest build can be found on the [releases page](https://github.com/ata4/disunity/releases).
+
+### A note about the versions
+
+0.3 works best with Unity 3.x and has most of the original extraction features.
+
+0.4 is a somewhat incomplete and untested upgrade to support Unity 4 and 5 and has some of the extraction features of 0.3.
+
+0.5 is a code rewrite to properly support all Unity games from 2 to 5 that also comes with unit tests. Right now, it only
+supports raw file reading and writing without any object deserialization, therefore it also can't extract any asset data directly.
+
+### Usage
+
+    disunity <command> [options] <file>
+
+**Note:** depending on the platform, you may need to run disunity.bat (Windows) or disunity.sh (Linux/MacOS). In case the launch script fails, try `java -jar disunity.jar`.
+
+### Available commands (v0.5)
+
+## Asset commands
+
+| Command           | Purpose
+| :---------------- | :----------------
+| asset blocks      | List data block offsets and sizes. Could be useful for manual extraction.
+| asset externals   | List asset file dependencies.
+| asset header      | Display some information from the file header.
+| asset objectids   | List object identifiers (Unity 5 and higher only).
+| asset objects     | List object data entries.
+| asset types       | Display embedded runtime type information.
+| asset unpack      | Unpacks raw data blocks from a file. Could be useful for manual extraction.
+
+## Asset bundle commands
+
+| Command           | Purpose
+| :---------------- | :----------------
+| bundle list       | List bundled files.
+| bundle info       | Display some information from the file header.
+| bundle pack       | Pack files into a bundle. Requires a bundle property file.
+| bundle unpack     | Unpack files from a bundle.