Added readme file and new binary

Author: NovaRain

README.md

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+# DAT2 - Fallout DAT file packer/unpacker
+
+A command-line tool for packing/unpacking Fallout 1/2 DAT files.
+
+Original author: **Anchorite (TeamX)**
+
+## Usage
+
+    dat2 <command> [options] [-t dir] [-d dir] DAT_file [list | @response_file]
+
+### Commands
+    a: Add files to DAT file. Create new if DAT file does not exist
+    x: Extract files from DAT file
+    d: Delete files from DAT file (only info about files)
+    l: List files in DAT file
+    k: Shrink DAT file
+
+### Options
+    -s: create Fallout 1 DAT file
+    -r: recurse into subdirectories
+    -0..9: Compression method
+           (Fallout1: 0 - store, other numbers - compress (default)
+           (Fallout2: 0 - store, 1 - best speed, 9 - best compression (default)
+    -p: extract without paths
+    -d: extract files into specified directory
+    -t: add files to specified directory of DAT file
+    --: end of options