Update Copyright

Author: tpeczek

README.md

@@ -3,4 +3,16 @@
 Sample project for demonstrating Push Notifications based on Push API and Web Push Protocol in ASP.NET Core:
 
 - [Push API](https://www.tpeczek.com/2017/12/push-notifications-and-aspnet-core-part.html)
-- [Requesting Delivery](https://www.tpeczek.com/2018/01/push-notifications-and-aspnet-core-part.html)
+- [Requesting Delivery](https://www.tpeczek.com/2018/01/push-notifications-and-aspnet-core-part.html)
+
+## Donating
+
+My blog and open source projects are result of my passion for software development, but they require a fair amount of my personal time. If you got value from any of the content I create, then I would appreciate your support by [buying me a coffee](https://www.buymeacoffee.com/tpeczek).
+
+<a href="https://www.buymeacoffee.com/tpeczek"><img src="https://www.buymeacoffee.com/assets/img/custom_images/black_img.png" style="height: 41px !important;width: 174px !important;box-shadow: 0px 3px 2px 0px rgba(190, 190, 190, 0.5) !important;-webkit-box-shadow: 0px 3px 2px 0px rgba(190, 190, 190, 0.5) !important;"  target="_blank"></a>
+
+## Copyright and License
+
+Copyright © 2017 - 2018 Tomasz Pęczek
+
+Licensed under the [MIT License](https://github.com/tpeczek/Demo.AspNetCore.PushNotifications/blob/master/LICENSE.md)