[WeOpen-Star] Add Quick start with websocket

[yu199195]

Description

Adding documentation for quick start with websocket protocol for shenyu

Task

1. Add english file : quick-start-websocket.md , under the https://github.com/apache/shenyu-website/tree/main/docs/quick-start
2. Add zh file : quick-start-websocket.md , under the https://github.com/apache/shenyu-website/tree/main/i18n/zh/docusaurus-plugin-content-docs/current/quick-start

How to do this

1. Java development, and familiar with spring boot.
2. You can see this : https://shenyu.apache.org/zh/docs/next/deployment/deployment-local , Complete your local environment.
3. Run shenyu/shenyu-examples/websocket
4. See websocket plugin doc ： https://shenyu.apache.org/zh/docs/next/plugin-center/proxy/websocket-plugin
5. Debugging WebSocketPlugin.java in your local.
6. Summarize the quick-start-websocket.md , including how to start, source code analysis, etc.
7. Pull Request to shenyu website ： https://github.com/apache/shenyu-websit

How to contributor

You can see this : Contributor Guide

I suggest you subscribe to shenyu dev mailing list, and when you encounter any problems, or when you finish,
you can send an email to dev@shenyu.apache.org

Verification

After you modify file ，You verify local and you can see this : Hao to build shenyu website .

After you pull request merged. You can verify to this : en-doc , zh-doc

How to Participation

1. reply: [WeOpen Star]I would like to help
2. add this wechat. note : 摘星

[lahmXu]

[WeOpen Star]I would like to help