Update README.md

Adding whatsup diagnostic query notebook to the list

Troubleshooting-Notebooks/README.md

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 Looking for guidance on troubleshooting common SQL Server issues? Look no further! In this folder you will find various notebooks that you can use in [Azure Data Studio](https://docs.microsoft.com/sql/azure-data-studio/what-is) to guide you through the steps necessary to troubleshoot and resolve some of the most common issues in SQL Server.
 
 **[BPCheck.ipynb](https://github.com/microsoft/tigertoolbox/blob/master/BPCheck/BPCheck.ipynb)** - This notebook checks SQL Server in scope for some of most common skewed Best Practices and performance issues. More details about BPCheck can be found [here](https://github.com/microsoft/tigertoolbox/tree/master/BPCheck).
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+**[whatsup_diagnostic_queries.ipynb](https://github.com/microsoft/tigertoolbox/blob/master/usp_WhatsUp/whatsup_diagnostic_queries.ipynb)** - This notebook contains a set of diagnostic queries that helps understand what's up with your SQL Server/Azure SQL Database and get all sorts of useful troubleshooting information such as: a snapshot on running sessions/requests, current blocking information, etc. More information about the Whats Up diagnostic queries can be found [here](https://github.com/microsoft/tigertoolbox/tree/master/usp_WhatsUp).