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README.md

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+# v2dat
+
+A cli tool that can unpack v2ray data packages, also known as `geoip.dat` and `geosite.dat`.
+
+## Usage
+
+```shell
+v2dat unpack geoip [-d output_dir] [-f tag]... geoip_file
+v2dat unpack geosite [-d output_dir] [-f tag[@attr]...]... geosite_file
+```
+
+- If `-d` was omitted, the current working dir `.` will be used.
+- If no filter `-f` was given. All tag will be unpacked.
+- If multiple `@attr` were given. Entries that don't contain any of given attrs will be ignored.
+- Unpacked text files will be named as `<geo_file>_<suffix>.txt`.