Add this new mod to the repository

[naota4]

• Name: [MST_Extra]
• Url: [https://github.com/chaosvolt/MST_Extra_Mod/archive/refs/heads/master.zip]
• Author: [chaosvolt]
• Homepage: [https://github.com/chaosvolt/MST_Extra_Mod]

[remyroy]

This project is now unmaintained but there are a few alternatives if you look.