add_palindrome_function

[tink012184]

Summary

Added a utility function to check whether a string is a palindrome. The function ignores case, spaces, and punctuation, and includes unit tests for validation.

Changes

• Added isPalindrome function in src/palindrome.js
• Added unit tests in test/palindrome.test.js
• Added .gitignore to exclude node_modules
• Updated README with setup and testing instructions

Testing

To run tests locally:

1. npm install
2. npm test

Test Coverage

• Validates a simple palindrome string
• Validates a sentence palindrome with spaces and capitalization
• Validates a non-palindrome string