feat:add solution for finding numbers with even number of digits

[Ruturaj-007]

Implemented the EvenDigits class to solve the LeetCode problem "Find Numbers with Even Number of Digits".
The program iterates through an integer array and counts how many numbers contain an even number of digits.
Includes:

• findNumbers(): counts numbers with even digits
• even(): checks if a number has an even number of digits
• digits(): calculates the total digits in a number

Tested with sample input {12, 345, 2, 6, 7896} producing output 2.