update readme

Author: qatoco

README.md

@@ -1,9 +1,20 @@
 # draft-js-image-insert-demo
 
-
 ```sh
+# 1. install and run demo page
 yarn && yarn start
-open http://localhost:3000
+
+# 2. run file upload/donwload sever locally
+docker run --rm -p 25478:25478 -v $HOME/tmp:/var/root mayth/simple-upload-server app -token f9403fc5f537b4ab332d /var/root
+# > time="2019-11-26T16:25:31Z" level=info msg="starting up simple-upload-server"
+# > time="2019-11-26T16:25:31Z" level=info msg="start listening" ip=0.0.0.0 port=25478 root=/var/root token=f9403fc5f537b4ab332d upload_limit=5242880
+
+# 3. upload test
+curl --form file=@`pwd`/demo1.gif 'http://localhost:25478/upload?token=f9403fc5f537b4ab332d'
+# > {"ok":true,"path":"/files/demo1.gif"}
+
+# 4. quit google chrome and re-run with cors-disabled
+open http://localhost:3000/ -a "/Applications/Google Chrome.app" --args --disable-web-security --user-data-dir
 ```
 
 ## demo
@@ -12,7 +23,6 @@ mutiple file
 
 ![img](./demo1.gif)
 
-
 resize
 
 ![img](./demo2.gif)