Create rotate_array.py

[MeloveGupta]

This PR adds the Rotate Array algorithm implemented in Python.
The problem rotates the elements of an array to the right by k steps, modifying the array in-place.

Key Details:

Algorithm Used: Array rotation using the Three-Reverse Technique

Time Complexity: O(n)

Space Complexity: O(1) (in-place rotation)

Alternate Approach: Also includes a secondary version using an extra array (O(n) space) for reference.

Approach:

Reverse the entire array.

Reverse the first k elements.

Reverse the remaining n–k elements.
This approach avoids additional space while maintaining linear time performance.

Files Added:

rotate_array.py → Core implementation with docstrings, helper functions, and examples.

[github-actions]

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[github-actions]

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✅ Passed - File naming and structure look good!

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✅ Passed - All code compiles successfully!

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[admirerr]

Approved