Add count numbers divisible

[AdvikHegde]

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Describe your change:

• Add an algorithm
• Fix a bug or typo in an existing algorithm
• Documentation change

Description:
Added a new algorithm countNumbersDivisible in Math/ folder.
It counts the total numbers divisible by a given divisor in a specified range [A, B].
The implementation uses integer division for accurate counting and handles edge cases such as zero divisor.

Reference: TutorialsPoint - Count numbers divisible by M

Checklist:

• I have read CONTRIBUTING.md
• This pull request is all my own work -- I have not plagiarized
• I know that pull requests will not be merged if they fail the automated tests
• This PR only changes one algorithm file
• All new JavaScript files are placed inside an existing directory (Math/)
• All filenames use the UpperCamelCase (PascalCase) style (CountNumbersDivisible.js)
• All new algorithms have a URL in their comments that points to Wikipedia or another similar explanation
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 56 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.67%. Comparing base (08d8c6b) to head (966a7b1).

Files with missing lines	Patch %	Lines
src/Math/CountNumbersDivisible.js	0.00%	56 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## master #1829 +/- ## ========================================== - Coverage 85.91% 85.67% -0.25%  ========================================== Files 379 380 +1 Lines 19778 19834 +56 Branches 3015 3017 +2 ========================================== Hits 16993 16993 - Misses 2785 2841 +56 

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