feat: add next-step hints and submodule check to CLI commands

src/commands/StartCommand.ts

@@ -55,6 +55,7 @@ export class StartCommand extends CLICommand {
     )
     console.log(`Issue #${issue.id} is now in-progress`)
     console.log(`Create the issue branch: git checkout -b ${issueBranch}`)
+    console.log(`If working in a submodule, also checkout there: cd <submodule> && git checkout -b ${issueBranch}`)
     return 0
   }
 }