docs: change the web startup method to experimental (#81)

Author: hacke2

README.md

@@ -43,15 +43,15 @@ yarn run electron-rebuild
 yarn run start
 ```
 
-### Start the project (web)
+### Start the web project (experimental)
 ```bash
 # install dependencies
 yarn
 # rebuild native dependencies for web
 yarn run web-rebuild
 # build web
 yarn run build-web
-# start project
+# start project, visit 127.0.0.1:8080
 yarn run start-web
 ```