feat: Added Shape Program for Hacktoberfest2025

[Ashwil-Colaco]

Closes #19

Program Details

Type of Program: OOP Concept
Concept Implemented: Polymorphism & Inheritance
Known Limitations: Works only for positive integers

Check List

• The file is placed in the correct subfolder.
• The file and main class are named using PascalCase.
• The code includes the required Javadocs-style header metadata.
• The code follows 4-space indentation and K&R brace style.
• A working main method is included to demonstrate the program.

[IamBisrutPyne]

Hey @Ashwil-Colaco 👋

This is an excellent addition to the OOP folder.
Note: It is generally safer to wrap Scanner in try-with-resources block.

Thank you for your contribution and Happy Hacking 🌟

[Ashwil-Colaco]

Thank you @IamBisrutPyne