add support link

Author: MexsonFernandes

README.md

@@ -1,2 +1,4 @@
 # ArduinoProjects
 This repo contains arduino code for various projects developed by RoboMex.
+
+<a href='https://ko-fi.com/Y8Y31LBT4' target='_blank'><img height='36' style='border:0px;height:36px;' src='https://cdn.ko-fi.com/cdn/kofi3.png?v=2' border='0' alt='Buy Me a Coffee at ko-fi.com' /></a>