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README.md

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+# nca-to-nsp
+
+A utility to package NCA files into a NSP using the PFS0 format.
+
+This tool works by:
+1. Reading the specified NCA files
+2. Creating a PFS0 header
+3. Combining the header with the NCA files into a single NSP file
+
+## Installation
+
+### Prerequisites
+
+- Go 1.24.2 or higher
+
+### Building from source
+
+```bash
+git clone https://github.com/yourusername/nca-to-nsp.git
+cd nca-to-nsp
+go build -o nca-to-nsp ./cmd/nca-to-nsp
+```
+
+## Usage
+
+Basic usage:
+
+```bash
+nca-to-nsp -o <output-file.nsp> file1.nca [file2.nca ...]
+```
+
+### Command-line Options
+
+| Flag | Default | Description |
+|------|---------|-------------|
+| `-o` | `out.nsp` | NSP output file name |
+| `-buffer` | `4096` | Buffer size for file copying operations |
+| `-progress` | `false` | Show progress bar |
+| `-h` | `false` | Display help information |
+| `-v` | `false` | Display version information |
+
+### Example
+
+Create an NSP file from NCA files with progress bar enabled:
+```bash
+./nca-to-nsp -o out.nsp -progress path/to/dir/*.nca
+```
+
+## License
+
+BSD-3-Clause, see [LICENSE](LICENSE) for more information.
+
+## Acknowledgments
+
+- [nspBuild](https://github.com/CVFireDragon/nspBuild) for inspiration on how to pack NCAs into NSP.