Added updated README.md

README.md

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 # udk-config-extractor
 
-Config extractor for UDK/UE3 games. Packs and unpacks ini files from coalesced.ini files
+A command-line tool for extracting and repacking UDK/UE3 coalesced config and localization files.
+
+Tested with Army of Two: The 40th Day (Xbox 360).
+
+## Features
+
+- Extract all files from coalesced archives
+- Repack directories back into coalesced format
+- List contents of an archive with file sizes
+- Extract individual files by index or name
+- Drag & drop support for quick extraction/packing
+- Auto-detect language extension when repacking (int, jpn, deu, fra, ita, etc.)
+
+## Supported Formats
+
+- `coalesced.ini` - Config files
+- `coalesced.int` - English localization
+- `coalesced.jpn` - Japanese localization
+- `coalesced.deu` - German localization
+- `coalesced.fra` - French localization
+- `coalesced.ita` - Italian localization
+- `coalesced.esn` - Spanish localization
+- And other UE3 localization formats
+
+## Usage
+
+```
+udk-config-extractor list <file>                     - List archive contents
+udk-config-extractor unpack <file> [output_dir]      - Extract all files
+udk-config-extractor pack <input_dir> <output_file>  - Create coalesced file
+udk-config-extractor info <file>                     - Show archive info
+udk-config-extractor extract <file> <index> [output] - Extract single file
+```
+
+### Drag & Drop
+
+- Drag a coalesced file onto the exe to extract to `./<name>_<ext>/`
+  - Example: `coalesced.ini` extracts to `coalesced_ini/`
+- Drag a folder onto the exe to pack into `./<name>.<ext>`
+  - Example: `coalesced_ini/` packs to `coalesced.ini`
+
+## Building
+
+Requires Qt 6 and a C++17 compiler.
+
+```bash
+qmake udk-config-extractor.pro
+make
+```
+
+## Notes
+
+- Preserves original file format for game compatibility
+- Maintains directory structure when extracting
+- Big-endian binary format (Xbox 360 / PS3)