Feat/tree and update checklist

[nihaltp]

closes #13

[Copilot]

Pull Request Overview

This PR implements a new tree command that displays directory structure in a hierarchical tree format and updates the project checklist to mark several commands as completed.

• Adds a new TreeCommand class that recursively displays directory contents with tree-like visual formatting
• Registers the tree command in the main App class
• Updates CheckList.md to mark tree, hostname, whoami, title, color, and time commands as completed

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/main/java/com/mycmd/commands/TreeCommand.java	New command implementation for displaying directory tree structure
src/main/java/com/mycmd/App.java	Registers the new tree command in the command map
CheckList.md	Updates completion status for multiple commands in the project checklist

Comments suppressed due to low confidence (1)

src/main/java/com/mycmd/commands/TreeCommand.java:1

• Missing import statement for TreeCommand. The class needs to be imported with 'import com.mycmd.commands.TreeCommand;'

package com.mycmd.commands;

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[anshumanjadiya1102]

@nihaltp Please see above suggestions

[nihaltp]

@anshumanjadiya1102 done