doc: add donation

Author: jesusvilla

README.md

@@ -244,6 +244,7 @@ $ npm run dev
 ## 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/donate/?hosted_button_id=CW2Z4CLAX2GVC)
 
 ## Thanks