Create _sidebar.md

Author: waqasm78

docs2/pages/troubleshooting/_sidebar.md

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+- [Trial Extend](trial.md)
+- [SQL Server Eval](sql-server-eval.md)
+- [SQL Server Function (UDF)](sql-server-function.md)
+- [SQL Server File Operation](sql-server-file-operation.md)
+- [SQL Server Regex](sql-server-regex.md)