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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