Create solution_java.java

[Shubham-09]

🚀 What does this PR do?

• Adds solution for LeetCode Daily Challenge for 12th October 2024 in Java.
• Used priority queue to track available chairs for all persons with time intervals

📝 Issue Reference:

Fixes issue: #14

🔍 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 log n)
• Space Complexity: O(n)

🌟 Additional Notes (if any):

N/A