docs: rename readme file to uppercase

[sukvvon]

Summary

• Like CONTRIBUTING.md DISCUSSION_TEMPLATE, ISSUE_TEMPLATE, LICENSE, renamed doc files to uppercase for consistency
• A README.md written in uppercase is traditionally widely used, and following this convention aligns with common practices.
  • Writing README.md in uppercase has been a long-standing convention in the open-source and GitHub communities.
  • This practice makes the filename more noticeable and intuitively conveys its importance as a core file of the project.

Check List

• pnpm run fix:format for formatting code and docs

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Name	Status	Preview	Comments	Updated (UTC)
zustand-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 15, 2025 2:55am

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commit: c8bd7ec

[dai-shi]

https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/creating-a-pull-request-template-for-your-repository

The doc shows the lower case.

[sukvvon]

https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/creating-a-pull-request-template-for-your-repository

The doc shows the lower case.

https://github.com/github/docs/blob/main/.github/PULL_REQUEST_TEMPLATE.md

The doc introduce only lowercase, but we can use uppercase like PULL_REQUEST_TEMPLATE.md

[dai-shi]

If both are officially supported, let's keep it lowercase.

[dai-shi]

We don't need (*) in the PR title, do we?