[FEATURE] Add new commands: pwd, clearhistory, and uptime

[yuvii-b]

Problem:

Currently, the mycmd project lacks a few helpful commands that are standard in many command-line tools.
For example, there’s no command to display the current working directory (pwd), clear the command history (clearhistory), or show how long the shell has been active (uptime).
These additions would make mycmd more feature-complete and user-friendly.

Solution:

Add the following commands:

• pwd: Prints the current working directory.
• clearhistory: Clears the stored command history.
• uptime: Displays how long the shell has been running since startup.

Implementation and Alternatives:

• Each command will follow the existing command structure and integrate with the core command registry.
• Extending the existing HistoryCommand to support a -c flag for clearing history, but a dedicated clearhistory command keeps usage simpler.
• Tracking uptime as part of the VersionCommand, though a standalone uptime command provides a cleaner experience.

Example:

mycmd> pwd
C:\Users\root\Projects\mycmd

mycmd> uptime
Up since 0h 12m 45s

mycmd> clearhistory
Command history cleared.

[github-actions]

👋 Hi @yuvii-b!
Thanks for opening an issue in MyCMD.
We’ll review it soon — meanwhile, please ensure logs and reproduction steps are clear.

[yuvii-b]

I’d like to work on this issue
Please assign it to me. Thanks!

[anshumanjadiya1102]

OK @yuvii-b, You can start working on this issue, Thanks. But Please be proactive.

If you will get 1 pull request merged, You will get automatic invite to our organization.