完成gif插件

packages/artplayer-plugin-gif/README.md

@@ -1,3 +1,63 @@
 # artplayer-plugin-gif
-Gif plugin for ArtPlayer
 
+Gif plugin for ArtPlayer, use [gifshot](https://github.com/yahoo/gifshot) as a dependency
+
+## Demo
+
+[Checkout the demo](https://artplayer.org/gif/) from Github Pages
+
+## Install
+
+Install with `npm`
+
+```
+$ npm install artplayer-plugin-gif
+```
+
+Or install with `yarn`
+
+```
+$ yarn add artplayer-plugin-gif
+```
+
+```js
+import artplayerPluginGif from 'artplayer-plugin-gif';
+```
+
+Or umd builds are also available
+
+```html
+<script src="artplayer-plugin-gif"></script>
+```
+
+Will expose the global variable to `window.artplayerPluginGif`.
+
+## Usage
+
+This will add a button called "GIF" in the bottom control bar.
+
+```js
+var art = new Artplayer({
+    container: '.artplayer-app',
+    url: 'path/to/video.mp4',
+    plugins: [artplayerPluginGif],
+});
+```
+
+Or can be called via api
+
+```js
+art.plugins.artplayerPluginGif.create(
+    {
+        // some configuration
+        // https://github.com/yahoo/gifshot#options
+    },
+    function(imageUrl) {
+        console.log(imageUrl);
+    },
+);
+```
+
+## License
+
+MIT © [Harvey Zack](https://www.zhw-island.com/)