feat(markdown): supports mermaid #137

docs/markdown.md

@@ -28,3 +28,26 @@ window.$docsify = {
   }
 }
 ```
+
+## Supports mermaid
+
+```js
+// Import mermaid
+//  <link rel="stylesheet" href="//cdn.jsdelivr.net/npm/mermaid/dist/mermaid.min.css">
+//  <script src="//cdn.jsdelivr.net/npm/mermaid/dist/mermaid.min.js"></script>
+
+window.$docsify = {
+  markdown: {
+    renderer: {
+      code: function(code, lang) {
+        if (lang === "mermaid") {
+          return (
+            '<div class="mermaid">' + mermaid.render(lang, code) + "</div>"
+          );
+        }
+        return this.origin.code.apply(this, arguments);
+      }
+    }
+  }
+}
+```