Add image to README for visual enhancement

Added an image to enhance the README description.

Author: haroontrailblazer

README.md

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 # StrengthX - Know How Strong Is Your Passwords
+<img width="512" height="279" alt="1000160838" src="https://github.com/user-attachments/assets/f5fef91c-11f8-4f31-a89d-de727aaba031" />
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 **StrengthX** is a web application that helps users evaluate the strength of their passwords and check if their passwords have been involved in known data breaches. It provides a quick and secure way to improve password security and promote safe online practices.  
 
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