added new dice roller

[vivek2004-sec]

Description

This PR adds a dice-rolling simulator feature. The user is prompted for how many dice to roll, and each die's outcome is displayed as ASCII/box-drawing art (rather than plain numbers) using a dice_art dictionary that maps each face (1–6) to a 5-line tuple of box-drawing characters (┌, ─, │, └) and dot symbols (●) for pips.
Dice are currently displayed in a horizontal layout — all dice printed side-by-side, line by line, so the output resembles a real dice throw laid out on a table. A vertical layout option (each die's art printed fully before the next) is included but currently commented out, so it can be toggled on if needed later.
Finally, the program calculates and prints the total sum of all dice rolled.
Problem it solves: Plain text dice output like [3, 5, 1] is unintuitive and unengaging. This makes rolls visually clear and more fun to read — useful for CLI board game utilities, tabletop RPG tools, or as a teaching example of dictionaries, string formatting, and nested loops.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Code cleanup/refactoring

Related Issues

Closes #3202

Testing

Please describe the tests you've run to verify your changes:

• Manual testing
• Added automated tests
• Existing tests pass

Checklist

• My code follows the project's code style
• I have commented my code, particularly in hard-to-understand areas
• I have updated the README.md if needed
• My changes generate no new warnings
• I have tested my code locally
• New and existing tests pass with my changes

Screenshots (if applicable)

Add screenshots or demos of your changes if relevant.