Update and rename LICENSE to LICENSE.md

[qwq233]

Title

介绍 / Description

更改内容 / Types of Changes

• 修复 Bugfix
• 新功能 New Feature
• 增强优化 Enhancement/optimization
• UI界面 User Interface
• 内核 Core
• 文档 Documentation
• 模板 Templates

由这个PR解决或关闭的Issues / Issues Fixed or Closed by This PR

检查列表 / Checklist

• 我的代码符合本仓库的代码规范 My code follows the code style of this project
• 我已经测试了这些更改，它们可以正常工作，既不会破坏原有任何功能(或我可以解决)，也不会影响对旧版本的支持 I have tested the changes and verified that they work and don't break anything(as well as I can manage) or drop the support for previous versions.
• 我已合并了对后续工作无意义的commit并确认不会对后续维护造成困扰 I have merged commits that are meaningless for follow-up work and confirmed that they will not cause damage to follow-up maintenance