docs: Apply markdownlint rules to README

README.md

@@ -1,3 +1,5 @@
+# mahjong
+
 [![Mahjong lib](https://github.com/MahjongRepository/mahjong/actions/workflows/lint_and_test.yml/badge.svg)](https://github.com/MahjongRepository/mahjong/actions/workflows/lint_and_test.yml)
 
 This library can calculate hand cost (han, fu with details, yaku, and scores) for riichi mahjong (Japanese version).
@@ -8,39 +10,43 @@ The code was validated on tenhou.net phoenix replays in total on **11,120,125 ha
 
 So, we can say that our hand calculator works the same way that tenhou.net hand calculation.
 
-# How to install
+## How to install
 
 ```bash
 pip install mahjong
 ```
 
-# Supported rules and usage examples
+## Supported rules and usage examples
 
 You can find usage examples and information about all supported rules variations in the [wiki](https://github.com/MahjongRepository/mahjong/wiki)
 
-# Local development setup
+## Local development setup
 
 To set up the project locally for development:
 
 1. Clone the repository:
-```bash
-git clone https://github.com/MahjongRepository/mahjong.git
-cd mahjong
-```
+
+    ```bash
+    git clone https://github.com/MahjongRepository/mahjong.git
+    cd mahjong
+    ```
 
 2. Setup env using [uv](https://github.com/astral-sh/uv):
-```bash
-uv venv
-```
+
+    ```bash
+    uv venv
+    ```
 
 3. Run tests to verify setup:
-```bash
-make tests
-# Or directly:
-uv run pytest
-```
+
+    ```bash
+    make tests
+    # Or directly:
+    uv run pytest
+    ```
 
 4. Run full checks before committing:
-```bash
-make check   # Runs format, lint, and tests
-```
+
+    ```bash
+    make check   # Runs format, lint, and tests
+    ```