Add SpiralMatrix.java to print a matrix in spiral order

[Ranit-cpu]

This Java program prints the elements of a 2D matrix in spiral order.

Key Features:

• Accepts any MxN matrix as input.
• Traverses the matrix in clockwise spiral order.
• Handles edge cases like single row or single column.

This is a helpful utility for understanding matrix traversal algorithms and is commonly asked in coding interviews.

Let me know if any improvements are needed. 🙂