Update README.md

Adding note to disambiguate from Ellisys product.

README.md

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 # Contributing
 
 This project welcomes contributions and suggestions.  Most contributions require you to agree to a
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 This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).
 For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or
 contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.
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+Note: **[Bluetooth Explorer](https://www.ellisys.com/products/bex400)** by Ellisys is a separate unaffiliated product.