[FEATURE] Implement ls Command (Unix-style directory listing)

[swatiicfai]

The shell is missing an ls command for listing files/folders in Unix style. Please add a new command class following existing patterns.

[github-actions]

👋 Hi @swatiicfai!

Thanks for opening an issue in MyCMD.

We’ll review it soon — please ensure reproduction steps and logs are included.

[mNik033]

Is this not already included? LsCommand.java.

[anshumanjadiya1102]

There is already a ls command. Please check Checklist.md @mNik033 and @swatiicfai

[github-actions]

⚠️ This issue has been automatically marked as stale because it has not had activity in 30 days. It will be closed if no further updates occur within 7 days. Thank you for contributing!