docs: Add a Readme document for the adapter.

.gitignore

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 #/wp-content/themes
 
 .idea/
-node_modules/
-dist/

asciiplayer/.gitignore

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+dist/
+node_modules/

asciiplayer/README.md

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+# wp-asciiplayer-adapter
+
+This library needs to be used with the WordPress Ascicast Player plugin.
+
+## How to work
+
+The Asciicast Player plugin will generate a div element containing the parameters required for asciicast playback for the asciiplayer short code in the post:
+
+```html
+<div class="asciiplayer-container" 
+     data-ap-src="https://asciinema.org/a/28307.cast" 
+     data-ap-opts="%7B%22fit%22%3A%22width%22%2C%22preload%22%3Atrue%7D">
+</div>
+```
+
+Then, the adapter will search for these div elements and use [asciinema-player](https://www.npmjs.com/package/asciinema-player) to create an Asciicast player within the div elements.

readme.txt

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+=== Asciicast Player ===
+Contributors: lamgc
+Tags: asciicast, asciiplayer, asciinema
+Requires at least: 5.2
+Tested up to: 6.2
+Stable tag: 0.1.0
+Requires PHP: 7.4
+License: GPLv3
+License URI: https://www.gnu.org/licenses/gpl-3.0.html
+
+Asciinema-Player for WordPress.
+
+== Description ==
+
+This plugin helps you insert Asciicast files into the post, better presenting terminal operations to readers.
+
+## Quick start
+
+Add a shortcode to the post and enter the following:
+
+```
+[asciiplayer]https://asciinema.org/a/28307.cast[/asciiplayer]
+```
+
+The content of the shortcode is the URL of the ascicast file.
+
+### Options
+
+The AsciiPlayer shortcode supports the options supported by Asciinema-player, such as setting `fit` to `height` and closing the control bar:
+
+```
+[asciiplayer fit="height" controls="false"]https://asciinema.org/a/28307.cast[/asciiplayer]
+```
+
+You can find all available options [here](https://www.npmjs.com/package/asciinema-player#options).
+
+> Currently, only the `logger` option is not supported because it requires an object to be passed in.
+
+#### Style options
+
+For the convenience of customizing player elements,
+the plugin has added an additional `style` **option**,
+which corresponds to the `style` **attribute** of the player container element:
+
+```
+[asciiplayer style="width: 80%;"]https://asciinema.org/a/28307.cast[/asciiplayer]
+```
+
+== Changelog ==
+
+= 0.1.0 =
+* The first available version.