Create digitial_root.py

[jatinnarula207-bot]

Describe your change:

Summary

Added a new algorithm file digital_root.py in the maths folder.

Description

This script calculates the digital root of a given number.
A digital root is obtained by summing the digits of a number repeatedly
until only a single-digit number remains.

Example

Input: 493193
Process: 4+9+3+1+9+3 = 29 → 2+9 = 11 → 1+1 = 2
Output: 2

Why this is useful

• Demonstrates looping and digit manipulation in Python.
• Adds a mathematical utility function not already present in the repository.
• Simple, efficient, and beginner-friendly for understanding recursion/iteration.

Hacktoberfest

This pull request is created as part of Hacktoberfest 2025 🎃

[algorithms-keeper]

Closing this pull request as invalid

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