method BaseCommand.prototype.commandimport { BaseCommand } from "https://dotland.deno.dev/x/cliffy@v0.9.0/mod.ts"; command(nameAndArguments: string,cmd?: BaseCommand | string,override?: boolean,): thisAdd new sub-command. ParametersnameAndArguments: stringoptionalcmd: BaseCommand | stringoptionaloverride: booleanReturnsthis