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Signed-off-by: Mehmet Samet Duman <yongdohyun@projecttick.org>

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+# libqrencode `libqrencode/`
+
+> **Type**: QR Code Generation Library  
+> **License**: LGPL-2.1-or-later  
+> **Fork Origin**: [GitHub](https://github.com/fukuchi/libqrencode)  
+> **Status**: Detached Fork (independently maintained)  
+> **Standards**: ISO/IEC 18004:2015
+> **Latest Version**: 0.0.5-1
+
+---
+
+## Overview
+
+libqrencode is a fast and compact library for encoding data into a QR Code symbol. It supports the full range of QR Code functionality as defined by the ISO standard.
+
+ProjT Launcher maintains a fork of libqrencode for controlled integration and monorepo CI compatibility.
+
+---
+
+## Usage in ProjT Launcher
+
+libqrencode is used for:
+
+- **Account linking** — Microsoft account QR authentication
+- **Share URLs** — Quick sharing of instance/mod links
+- **Export/Import** — Instance configuration sharing
+
+---
+
+## Features
+
+| Feature | Status |
+|---------|--------|
+| QR Code Model 1 & 2 | ✅ |
+| Micro QR Code | ✅ |
+| All error correction levels | ✅ |
+| Structured append | ✅ |
+| 8-bit byte mode | ✅ |
+| Kanji mode | ✅ |
+| ECI mode | ✅ |
+
+### Error Correction Levels
+
+| Level | Recovery | Use Case |
+|-------|----------|----------|
+| L | ~7% | High density |
+| M | ~15% | Standard (default) |
+| Q | ~25% | Industrial |
+| H | ~30% | Critical data |
+
+---
+
+## Build Instructions
+
+### Prerequisites
+
+- **CMake 3.10+** or **Autotools**
+- **C99 compiler** (GCC, Clang, MSVC)
+- **libpng** (optional, for PNG output)
+
+### CMake Build
+
+```bash
+cd libqrencode
+mkdir build && cd build
+cmake .. -DCMAKE_BUILD_TYPE=Release
+cmake --build .
+ctest -V
+```
+
+### Autotools Build
+
+```bash
+cd libqrencode
+./autogen.sh
+./configure
+make
+make check
+```
+
+### CMake Options
+
+| Option | Description | Default |
+|--------|-------------|---------|
+| `WITH_TOOLS` | Build qrencode CLI tool | `ON` |
+| `WITH_PNG` | Enable PNG support | `ON` |
+| `WITH_TESTS` | Build test suite | `ON` |
+| `BUILD_SHARED_LIBS` | Build shared library | `ON` |
+
+---
+
+## API Usage
+
+### Basic Example
+
+```c
+#include <qrencode.h>
+#include <stdio.h>
+
+int main() {
+    QRcode *qr = QRcode_encodeString("https://projecttick.org",
+                                      0,                    // Version (0 = auto)
+                                      QR_ECLEVEL_M,         // Error correction
+                                      QR_MODE_8,            // Encoding mode
+                                      1);                   // Case sensitive
+
+    if (qr == NULL) {
+        fprintf(stderr, "Failed to encode\n");
+        return 1;
+    }
+
+    // Access the QR code data
+    printf("Version: %d\n", qr->version);
+    printf("Width: %d\n", qr->width);
+
+    // qr->data contains the QR code matrix
+    // Each byte: bit 0 = module (1=black, 0=white)
+
+    QRcode_free(qr);
+    return 0;
+}
+```
+
+### Structured Append (Large Data)
+
+```c
+// Split data across multiple QR codes
+QRcode_List *list = QRcode_encodeStringStructured(
+    large_data, 0, QR_ECLEVEL_M, QR_MODE_8, 1);
+
+for (QRcode_List *entry = list; entry != NULL; entry = entry->next) {
+    // Process each QR code in sequence
+    process_qrcode(entry->code);
+}
+
+QRcode_List_free(list);
+```
+
+---
+
+## Command Line Tool
+
+The `qrencode` CLI tool creates QR code images:
+
+```bash
+# Generate PNG
+qrencode -o output.png "Hello World"
+
+# Generate SVG
+qrencode -t SVG -o output.svg "https://projecttick.org"
+
+# Generate ASCII art
+qrencode -t ASCII "Hello World"
+
+# Specify error correction level
+qrencode -l H -o secure.png "Sensitive Data"
+```
+
+### Output Formats
+
+- PNG (requires libpng)
+- EPS
+- SVG
+- ANSI terminal
+- ASCII art
+- UTF-8 terminal
+
+---
+
+## Documentation
+
+| Resource | Location |
+|----------|----------|
+| API Reference | `libqrencode/qrencode.h` |
+| Man Page | `libqrencode/qrencode.1.in` |
+| [Original README](../../libqrencode/README.md) | Upstream library documentation |
+
+---
+
+## Testing
+
+```bash
+cd libqrencode/build
+ctest -V
+
+# Or with autotools
+cd libqrencode
+make check
+```
+
+See [ci-libqrencode.yml](../../.github/workflows/ci-libqrencode.yml) for CI configuration.
+
+---
+
+## Copyright & Licensing
+
+```
+Copyright (C) 2006-2017 Kentaro Fukuchi <kentaro@fukuchi.org>
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+```
+
+Full license: `libqrencode/COPYING`
+
+---
+
+## Related Documentation
+
+- [Third-party Libraries](./third-party.md) — All dependencies
+
+---
+
+## External Links
+
+- [libqrencode GitHub](https://github.com/fukuchi/libqrencode)
+- [ISO/IEC 18004](https://www.iso.org/standard/62021.html) — QR Code standard
+- [QR Code Wikipedia](https://en.wikipedia.org/wiki/QR_code)
+- [ZXing](https://github.com/zxing/zxing) — QR Code reading library