Added README.md

README.md

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+# Bleh!
+
+![bleh cat](./bleh.jpg)
+
+**Bleh!** is a command-line utility to print images on the MXW01 Bluetooth thermal printer.
+It supports 1-bit (1bpp) and 4-bit (4bpp) printing, various dithering algorithms, PNG preview output, and direct communication with the printer via BLE.
+
+## Features
+
+* Print PNG/JPG images (from file or stdin) in 1bpp or 4bpp mode
+* Multiple dithering algorithms (Floyd-Steinberg, Bayer, Atkinson, etc.)
+* Query printer status, battery, version, and more
+* Output a PNG preview instead of printing (for integration or testing)
+* Command-line interface with fine-grained options
+* Works on Linux using BlueZ (via [go-ble/ble](https://github.com/go-ble/ble))
+
+## Compiling
+
+On a Linux system, run:
+
+```sh
+go get bleh
+```
+
+Then:
+
+```
+go build
+```
+
+## Usage
+
+```sh
+bleh [options] <image_path or ->
+```
+
+### Options
+
+| Option               | Description                                                                         |
+| -------------------- | ----------------------------------------------------------------------------------- |
+| `-i`, `--intensity`  | Print intensity (0-100) (default: 80)                                               |
+| `-m`, `--mode`       | Print mode: 1bpp or 4bpp (default: "1bpp")                                          |
+| `-d`, `--dither`     | Dither method: none, floyd, bayer2x2, bayer4x4, bayer8x8, bayer16x16, atkinson, jjn |
+| `-s`, `--status`     | Query printer status                                                                |
+| `-b`, `--battery`    | Query battery level                                                                 |
+| `-v`, `--version`    | Query printer version                                                               |
+| `-p`, `--printtype`  | Query print type                                                                    |
+| `-q`, `--querycount` | Query internal counter                                                              |
+| `-E`, `--eject`      | Eject paper by N lines                                                              |
+| `-R`, `--retract`    | Retract paper by N lines                                                            |
+| `-o`, `--output`     | Output PNG preview instead of printing. If value is "-", writes PNG to stdout.      |
+| `<image_path or ->`  | Path to PNG/JPG image to print, or "-" for stdin                                    |
+
+### Example
+
+```sh
+bleh -m 4bpp -d floyd ./myimage.png
+```
+
+## Requirements
+
+* Go 1.18+
+* BlueZ on Linux (for BLE support)
+* Dependencies listed in `go.mod` (see source)
+
+## License
+
+This project is licensed under the terms of the GNU General Public License v3.0 or later.
+Parts of the code were ported from [CatPrinterBLE](https://github.com/MaikelChan/CatPrinterBLE) and are licensed under the MIT License.
+See the [`LICENSE`](./LICENSE) file for details.
+
+> **Disclaimer:**
+> While a license was only added after the project’s initial commits, the current license applies retroactively to all previous commits of this repository.