added support message (#67)

README.md

@@ -26,3 +26,7 @@ provided by the bot. You will only need to do this once across all repos using o
 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.
+
+## Support
+
+setup-kubectl is an open source project that is [**not** covered by the Microsoft Azure support policy](https://support.microsoft.com/en-us/help/2941892/support-for-linux-and-open-source-technology-in-azure). [Please search open issues here](https://github.com/Azure/setup-kubectl/issues), and if your issue isn't already represented please [open a new one](https://github.com/Azure/setup-kubectl/issues/new/choose). The project maintainers will respond to the best of their abilities.