Add Subroutine for Even or Odd Number Check

[bavitha01]

Description:

This pull request introduces a new Perl script that checks whether a given number is even or odd using a subroutine. The script follows best practices, including strict and warnings for better debugging.

Changes Made:

1. Added a subroutine check_even_odd($num) to determine if a number is even or odd.
2. Used STDIN for user input and chomp to handle newline characters.
3. Implemented a ternary conditional operator to return the result concisely.

How It Works:

1. The script prompts the user to enter a number.
2. The input is passed to the check_even_odd subroutine.
3. The subroutine evaluates the number and returns either "Even" or "Odd".
4. The result is printed to the console.

Testing:

Tested with multiple inputs to verify correctness.
Handles both even and odd numbers correctly.

Example output:
Enter a number: 8 8 is Even