[NMR] New Mirror Request for leopard.sh

[basiczombie-47]

Note

• [x] I understand that irregular questions may be rejected.
• [x] I understand that the issue raised here is not related to the front-end.
• [x] I have looked it up in the NJU mirror, it's not in there now.
• [x] I have looked it up in opening issue, it's not suggested by others.
• [x] I have looked it up in closed issue, it's not refused by @yaoge123 for some reasons.
• [x] I'm willing to add an NJU-mirror description to the original repo.

Normal Repo

• [x] rsync://leopard.sh::html 同步地址
• [x] https://leopard.sh 项目地址

一个给powerpc mac老电脑用的包管理器，提供了许多常用软件包，解决了老电脑编译过慢的问题