Update README.md

Author: GaProgMan

README.md

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 # dwCheckUI
 A collection of .NET Core MVVM applications which use the dwCheckApi project
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+## Support This Project
+
+If you have found this project helpful, either as a library that you use or as a learning tool, please consider buying me a coffee:
+
+<a href="https://www.buymeacoffee.com/dotnetcoreshow" target="_blank"><img src="https://www.buymeacoffee.com/assets/img/custom_images/orange_img.png" alt="Buy Me A Coffee" style="height: 41px !important;width: 174px !important" ></a>