Add RotateImage algorithm implementation in Java

[priyashuu]

This PR adds a Java implementation for the Rotate Image (90° Clockwise) problem.
The goal is to rotate an n × n matrix in place without allocating extra space.

The solution is implemented in two simple steps:

Transpose the matrix (swap rows with columns).

Reverse each row to achieve the 90° clockwise rotation.

Key Features:

• Efficient in-place matrix rotation.
• Uses intuitive logic (transpose + reverse).
• Works for both even and odd-sized matrices.
• Includes an example in the main() method for testing.

Example:

Input:

[[1,2,3],
[4,5,6],
[7,8,9]]

Output:

Complexity Analysis:

Time Complexity: O(n²)

Space Complexity: O(1)

Files Added:

RotateImage.java ; includes implementation, example, and complexity analysis.

[github-actions]

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[github-actions]

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