Update README.md

[tzhangchi]

No description provided.

[github-actions]

• The newly added link for "univer" does not have a description like the other links. It would be helpful to provide a brief description of what "univer" is or what it does.
• The link for "affine-client" in the Libraries section is broken. It leads to a 404 page. Please ensure that the link is correct and functional.
• The formatting of the README file could be improved. There are inconsistent line breaks and spacing between sections. Consider organizing the content in a more structured and visually appealing manner.
• It would be beneficial to provide more information about each project, such as a brief overview or key features. This would help readers understand the purpose and value of each project more easily.
• Consider adding a table of contents at the beginning of the README file to provide an overview of the different sections and make it easier for readers to navigate through the document.