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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 algorithmcountNumbersDivisible inMath/ 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 readCONTRIBUTING.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 containsFixes: #{$ISSUE_NO}