Binary To Decimal in Java

This issue is for adding a new Java class BinTODecimal in the Maths package. The class contains a method to convert a binary number (provided as an integer) to its decimal equivalent. The goal is to provide functionality for binary-to-decimal conversion using basic mathematical operations.

@Kavya-24 Please assign me this under the Octoberfest 2024 Label :) and a good first issue