import { Subcommand } from "https://deno.land/x/line@v1.0.1/src/subcommand.ts";
This method is to be implemented by the user of this framework. This method
is executed during runtime and should contain the code that this subcommand
should process. For example, if the subcommand should write a file, then
this method could have Deno.writeFileSync( ... )
in its body.