Update README.md

Author: lminhtm

README.md

@@ -59,3 +59,6 @@ Minh Luong Nguyen
 
 ## Projects using LMGeocoder
 Feel free to add your project [here](https://github.com/lminhtm/LMGeocoder/wiki/Projects-using-LMGeocoder)
+
+## Donations
+[![paypal](https://www.paypalobjects.com/en_US/i/btn/btn_donateCC_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=J3WZJT2AD28NW&lc=VN&item_name=LMGeocoder&currency_code=USD&bn=PP%2dDonationsBF%3abtn_donateCC_LG%2egif%3aNonHosted)