add plugin for codefund (#471)

Author: njleonzhang

docs/plugins.md

@@ -147,7 +147,7 @@ Disqus comments. https://disqus.com/
 
 ## Gitalk
 
-[Gitalk](https://github.com/gitalk/gitalk) is a modern comment component based on Github Issue and Preact. 
+[Gitalk](https://github.com/gitalk/gitalk) is a modern comment component based on Github Issue and Preact.
 
 ```html
 <link rel="stylesheet" href="//unpkg.com/gitalk/dist/gitalk.css">
@@ -176,3 +176,17 @@ Pagination for docsify. By [@imyelo](https://github.com/imyelo)
 <script src="//unpkg.com/docsify-pagination/dist/docsify-pagination.min.js"></script>
 ```
 
+## codefund
+a [plugin](https://github.com/njleonzhang/docsify-plugin-codefund) to make it easy to join up [codefund](https://codesponsor.io/)
+
+> codefund is formerly known as "codesponsor"
+
+```
+<script src="//unpkg.com/docsify/lib/docsify.min.js"></script>
+
+window.$docsify = {
+  plugins: [
+    DocsifyCodefund.create('51d43327-eea3-4e27-bd44-e075e67a84fb') // change to your codefund id
+  ]
+}
+```

docs/zh-cn/plugins.md

@@ -151,7 +151,7 @@ Disqus comments. https://disqus.com/
 
 ## Gitalk
 
-[Gitalk](https://github.com/gitalk/gitalk) is a modern comment component based on Github Issue and Preact. 
+[Gitalk](https://github.com/gitalk/gitalk) is a modern comment component based on Github Issue and Preact.
 
 ```html
 <link rel="stylesheet" href="//unpkg.com/gitalk/dist/gitalk.css">
@@ -179,3 +179,19 @@ Pagination for docsify. By [@imyelo](https://github.com/imyelo)
 <script src="//unpkg.com/docsify/lib/docsify.min.js"></script>
 <script src="//unpkg.com/docsify-pagination/dist/docsify-pagination.min.js"></script>
 ```
+
+
+## Code Fund
+帮你快速接入[Code Fund](https://codesponsor.io/)的[插件](https://github.com/njleonzhang/docsify-plugin-codefund), 由[@njleonzhang](https://github.com/njleonzhang)提供。
+
+> Code Fund 以前叫 codesponsor
+
+```
+<script src="//unpkg.com/docsify/lib/docsify.min.js"></script>
+
+window.$docsify = {
+  plugins: [
+    DocsifyCodefund.create('51d43327-eea3-4e27-bd44-e075e67a84fb') // 把这个id改成你的codefund id
+  ]
+}
+```