Add solution for Day 19 problem in Java

[panchal20bhavin]

🚀 What does this PR do?

• Adds solution for LeetCode Daily Challenge on (Day and Date) in (Programming Language).
• The solution implements a recursive approach to solve the problem "Find kth Bit".

📝 Issue Reference:

Fixes issue: #19

🔍 Checklist:

Please ensure the following before submitting your PR:

• I have placed my solution in the correct folder (solutions/dayXX/).
• My code follows clean coding practices and is efficient.
• I have added comments in my code to explain the approach.
• I have updated the README.md for the specific day with a brief explanation of my solution.
• I have tested the solution on LeetCode and it works correctly.

🔧 Solution Details:

• Language Used: Java
• Time Complexity: O(n)
• Space Complexity: O(n)

[panchal20bhavin]

@arya2004 First time i have created PR in this Repo so could you please review it?