Merge branch '#1_reduce_screen_flickering'

.markdownlint.jsonc

@@ -0,0 +1,14 @@
+{
+    // MD007/ul-indent Unordered list indentation
+    "ul-indent": {
+        "indent": 4
+    },
+
+    // MD013/line-length Line length
+    "line_length": false,
+
+    // MD033/no-inline-html Inline HTML
+    "no-inline-html": {
+        "allowed_elements": ["h1", "img", "kbd"]
+    }
+}

README.md

@@ -1,91 +1,79 @@
-AWKTC
-=====
+# AWKTC
 
-![Screenshot (width: 12)](./md-images/screenshot-width12.png)
+![GitHub top language](https://img.shields.io/github/languages/top/mikkun/AWKTC)
+![GitHub release (latest by date)](https://img.shields.io/github/v/release/mikkun/AWKTC)
+![GitHub license](https://img.shields.io/github/license/mikkun/AWKTC)
 
-**A**WKTC is **W**orkable **K**lutzy **T**ime-wasting **C**ommand
+> :joystick: **A**WKTC is **W**orkable **K**lutzy **T**ime-wasting **C**ommand
 
-Description
------------
+## Description
 
 **AWKTC** is a Tetris-like tile-matching puzzle game written in AWK.
 
-Requirements
-------------
+![AWKTC screenshot (width: 12)](./md-images/screenshot-width12.png)
 
-* `gawk` or `awk` (except `mawk`)
-* [GNU coreutils](https://www.gnu.org/software/coreutils/) or equivalent BSD command (`dd`, `echo`, `sleep`, `stty`)
+## Requirements
 
-Supported Platforms
--------------------
+- `gawk` or `nawk`
+- [GNU coreutils](https://www.gnu.org/software/coreutils/) or equivalent BSD command (`dd`, `echo`, `sleep`, `stty`)
 
-**AWKTC** has been tested in the following platforms:
+## Installation
 
-* Debian GNU/Linux 10
-* FreeBSD 12.1-RELEASE
+```shell
+git clone https://github.com/mikkun/AWKTC.git
+```
 
-How to Play
------------
+## How to Play
 
-### Running the Game ###
+### Running the Game
 
-```console
-$ cd /path/to/AWKTC
-$ ./awktc.awk
+```shell
+cd /path/to/AWKTC
+./awktc.awk
 ```
 
-### Controls ###
+### Controls
 
-* <kbd>a</kbd>: Move left
-* <kbd>d</kbd>: Move right
-* <kbd>k</kbd>: Rotate left
-* <kbd>l</kbd>: Rotate right
-* <kbd>s</kbd>: Fall faster
-* <kbd>p</kbd>: Pause
-* <kbd>q</kbd>: Quit
+- <kbd>a</kbd>: Move left
+- <kbd>d</kbd>: Move right
+- <kbd>k</kbd>: Rotate left
+- <kbd>l</kbd>: Rotate right
+- <kbd>s</kbd>: Fall faster
+- <kbd>p</kbd>: Pause
+- <kbd>q</kbd>: Quit
 
-### Beneficial Item ###
+### Beneficial Item
 
-* ![Black piece](./md-images/special_piece.png) - __Special Piece__ - Destroys horizontal lines even if they have gaps of blocks.
+- ![Black piece](./md-images/special_piece.png) - **Special Piece** - Destroys horizontal lines even if they have gaps of blocks.
 
-### All Clear Bonus ###
+### All Clear Bonus
 
 If you clear all the blocks, then you will get an "All Clear Bonus".
 
-Changing the Playfield Width
-----------------------------
+## Changing the Playfield Width
 
 You can change the playfield width between 4 and 24 cells. By default, the playfield width is 12 cells.
 
-### Example Minimum Width ###
+### Example Minimum Width
 
-```console
-$ ./awktc.awk 4
+```shell
+./awktc.awk 4
 ```
 
-![Screenshot (width: 4)](./md-images/screenshot-width04.png)
+![AWKTC screenshot (width: 4)](./md-images/screenshot-width04.png)
 
-### Example Maximum Width ###
+### Example Maximum Width
 
-```console
-$ ./awktc.awk 24
+```shell
+./awktc.awk 24
 ```
 
-![Screenshot (width: 24)](./md-images/screenshot-width24.png)
+![AWKTC screenshot (width: 24)](./md-images/screenshot-width24.png)
 
-Installation
-------------
+## License
 
-```console
-$ git clone https://github.com/mikkun/AWKTC.git
-```
+[MIT License](./LICENSE)
 
-Author
-------
+## Author
 
 [KUSANAGI Mitsuhisa](https://github.com/mikkun)
-
-License
--------
-
-[MIT License](./LICENSE)