From ad13fd6ed4fe8decaf881f250dd1e18ff9fc2244 Mon Sep 17 00:00:00 2001
From: Tien Nguyen Minh <tiennm99@outlook.com>
Date: Mon, 11 May 2026 17:04:12 +0700
Subject: [PATCH] docs: add README

---
 README.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 README.md

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..47a3e19
--- /dev/null
+++ b/README.md
@@ -0,0 +1,15 @@
+# sudoku-solver
+
+Sudoku solver written in PHP.
+
+## Usage
+
+```bash
+php sudoku.php
+```
+
+Edit `sudoku.php` to define the puzzle (9×9 grid with `0` for empty cells).
+
+## License
+
+Apache-2.0