opened
island205
username_0
Please make sure these boxes are checked before submitting your PR, thank you!

* [ ] Make sure you follow Element's contributing guide ([中文](https://github.com/ElemeFE/element/blob/master/.github/CONTRIBUTING.zh-CN.md) | [English](https://github.com/ElemeFE/element/blob/master/.github/CONTRIBUTING.en-US.md) | [Español](https://github.com/ElemeFE/element/blob/master/.github/CONTRIBUTING.es.md)).
* [ ] Make sure you are merging your commits to `dev` branch.
* [ ] Add some descriptions and refer relative issues for you PR.
Docs: Add more detail about how to run play mode for contribution
issue