Update README.md

Cinchoo · Jun 29, 2020 · 007c020 · 007c020
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diff --git a/README.md b/README.md
@@ -135,3 +135,7 @@ where:
     using (ChoPGPEncryptDecrypt pgp = new ChoPGPEncryptDecrypt())
         pgp.GenerateKey("pub.asc", "pri.asc", "[email protected]", "Test123");
 ```
+
+If this project help you reduce time to develop, you can give me a cup of coffee :)
+
+[![paypal](https://www.paypalobjects.com/en_US/i/btn/btn_donateCC_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=6S2UVXDPR63X8&source=url)