Updated README.

README.md

@@ -4,6 +4,8 @@
 
 **Clocker** is an OSX menubar utility designed to help you keep track of your friends in different time zones.  It's written using Objective-C and is completely ad-free.
 
+If you'd like to donate, you can do so [here](https://www.paypal.me/AbhishekBanthia).
+
 [![Download on the App Store](https://github.com/Abhishaker17/Clocker/blob/v1.2.1/Clocker/Images/MacAppStore.png)](https://itunes.apple.com/us/app/clocker-menubar-world-clock/id1056643111?mt=12)
 
 Need any help? Open an issue!