README Formatting suggestion

The README is comprehensive and helpful, and could be even better served if at the top of the README there was a row of all the major header (perhaps even linked to jump the the part of the page it references), and a description of aforementioned headers so that users could more easily navigate it, especially for newcomers.

首先打开仓库的 README，查看其中现有的主要标题和结构。在靠近开头的位置添加一行包含这些标题及简短描述的链接，然后验证每个链接都会跳转到预期的部分，并确保 README 对新手来说仍然易于阅读。