Added donate button

Signed-off-by: rpgmaker <olamide.bakre@gmail.com>

Author: rpgmaker

README.md

@@ -77,3 +77,9 @@ Other Downloads
 ===============
 
 Nuget: https://www.nuget.org/packages/NetJSON/
+
+
+## Donation
+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=645PARZR4MBX4)