Added DigitalRoot in Math Module

[HIMANADH789]

##What does the PR do?
Added Digital Root functionality to Maths module.

Fixes #1747

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.77%. Comparing base (08d8c6b) to head (bae1827).

Files with missing lines	Patch %	Lines
Maths/DigitalRootAlgorithm.js	0.00%	32 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## master #1793 +/- ## ========================================== - Coverage 85.91% 85.77% -0.14%  ========================================== Files 379 380 +1 Lines 19778 19810 +32 Branches 3015 3017 +2 ========================================== Hits 16993 16993 - Misses 2785 2817 +32 

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