Added day2 solution in python

[kushal7201]

Issue: #2

🔍 Checklist:

Please ensure the following before submitting your PR:

• [x] I have placed my solution in the correct folder (solutions/dayXX/).
• [x] My code follows clean coding practices and is efficient.
• [x] I have added comments in my code to explain the approach.
• [x] I have tested the solution on LeetCode and it works correctly.

🔧 Solution Details:

• Language used: Python
• Time Complexity: O(n*logn)

🌟 Additional Notes:

• It uses a set to collect unique elements.
• It assigns ranks based on the sorted unique elements.
• It replaces the original array values with their corresponding ranks.

[kushal7201]

@arya2004 Kindly review and merge my PR

[arya2004]

lgtm!