Update readme.md

Author: iamAntimPal

LeetCode SQL 50 Solution/595. Big Countries/readme.md

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-Below is the structured README.md snippet for **LeetCode 595: Big Countries**, including the problem statement, example, solution approaches (SQL and Pandas), file structure, and useful links.
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 # **595. Big Countries**
 
 ## **Problem Statement**
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 - [SQL WHERE Clause](https://www.w3schools.com/sql/sql_where.asp)
 - [Pandas Documentation](https://pandas.pydata.org/docs/)
 
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-This structured format provides a comprehensive overview of the problem along with multiple solution approaches. Happy coding! 🚀