feat: add palindrome checker script

[ananthasai-2006]

Description

Added a new Python script under scripts/palindrome_checker.py.

• Checks if a given word or phrase is a palindrome
• Ignores case and spaces
• Verified and tested locally before submission

Author

Ananth Sai

[ananthasai-2006]

Thank you for reviewing! This is my first open-source contribution.