feat(easyIndex): add react-draggable dep

Author: mortalYoung

package.json

@@ -124,6 +124,7 @@
         "react-markdown": "~8.0.6",
         "react-syntax-highlighter": "~15.5.0",
         "remark-gfm": "~3.0.1",
+        "react-draggable": "~4.4.6",
         "shortid": "^2.2.16",
         "showdown": "^1.9.0"
     },