Update README.md

Author: learning-zone

README.md

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 *Click <img src="https://github.com/learning-zone/mysql-interview-questions/blob/master/assets/star.png" width="20" height="20" align="absmiddle" title="Star" /> if you like the project. Pull Request are highly appreciated.*
 
+### Table of Contents
+
+* [MySQL Queries](mysql-queries.md)
+
+
 #### Q. What are indexes in a Database? What are the types of indexes?
 #### Q. What are the different tables present in MySQL?
 #### Q. What are the technical features of MySQL?