Create README.md

Author: myfreeer

README.md

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+# chrome-pak-customizer
+a simple batch tool to customize pak files in chrome or chromium-based browser  
+
+## Badges
+[![Build status](https://ci.appveyor.com/api/projects/status/4ji3guqh4yyjfiaa?svg=true)](https://ci.appveyor.com/project/myfreeer/chrome-pak-customizer)
+[![Download](https://img.shields.io/github/downloads/myfreeer/chrome-pak-customizer/total.svg)](https://github.com/myfreeer/chrome-pak-customizer/releases)
+[![Latest Release](https://img.shields.io/github/release/myfreeer/chrome-pak-customizer.svg)](https://github.com/myfreeer/chrome-pak-customizer/releases/latest)
+[![GitHub license](https://img.shields.io/github/license/myfreeer/chrome-pak-customizer.svg)](LICENSE)     
+
+## License
+* Windows builds are licensed `LGPL 2.1+` **by default**, can be disabled by appending `-DLGPL=OFF` to cmake.
+* Non-windows builds and builds with `-DLGPL=OFF` are licensed MIT.
+
+## Usage (Windows Only)
+1. Download `chrome-pak.7z` from [releases](https://github.com/myfreeer/chrome-pak-customizer/releases) and extract it to any folder.
+2. Drag the pak file and drop it to `unpack.bat`.
+3. The pak file would be extracted to subfolder of the folder of the pak file, 
+with the same name of the pak file with an `_unpacked` suffix.
+4. (Optional) modify extracted files.
+5. Drag `pak_index.ini` to `pack.bat`.
+6. Repacked pak file would be in the same folder of `pak_index.ini` with a name like `pak_index_packed.pak`.
+
+## Usage (Command line)
+```
+pak -u pak_file target_path
+Unpack chrome pak file at pak_file to target_path.
+
+pak -p pak_index_file target_pak_file
+Pack chrome pak file using pak_index_file to target_pak_file.
+pak_index_file would be found in unpacked path.
+```
+
+## Building
+### Prerequires
+* gcc
+* cmake
+* ninja
+
+### Build script example
+```bash
+# Getting source
+git clone https://github.com/myfreeer/chrome-pak-customizer --branch=develop --depth=1
+cd chrome-pak-customizer
+
+# Creating folder for build
+mkdir -p build
+cd build
+
+# Running cmake
+cmake -GNinja -DLGPL=OFF ..
+
+# Building
+ninja
+```
+### CMake options
+* `LGPL`: Enable LGPL 2.1+ licensed custom startfiles on windows for smaller binary
+
+## Credits
+* https://www.chromium.org/
+* https://github.com/shuax/ChromePAK
+* https://github.com/myfreeer/win-startup-headers