Specification and Use Case Update

[B-Weiss]

• Updated specifications
• added use cases
• fixed broken links
• fixed formatting issues
• set use case links to open in new tab

[zzj1993]

已收到您的邮件~

[TanNingMeng]

感谢您的来信，我会尽快阅读的。- 致敬 谭建程