This is a shell command for use under the ORCA or GNO shell which can convert from a markdown file to a Teach text file which can be opened on a real or emulated Apple //gs. Because it is a shell command, it can also be used from Golden Gate. This is the primary use case for this command.
The intention is to use this command at build time on a modern system. When building a GS application, you may want to also create documentation that ships with that application. This shell command allows you to write that documentation in a modern format and then convert that to a format that can then be loaded on a GS.