Update README.md

Author: spacehuhn

README.md

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 # ESP8266 Deauther
 Deauthentication attack and other hacks using an ESP8266.
 
-![esp8266 deauther with a smartphone](https://raw.githubusercontent.com/spacehuhn/esp8266_deauther/master/screenshots/smartphone_esp_1.jpg)
+![esp8266 deauther with a smartphone](https://raw.githubusercontent.com/spacehuhn/esp8266_deauther/master/screenshots/smartphone_esp_1.jpg)  
+
+[![Donate](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=RCHANSVSX9M8C)
 
 ## Contents
 - [Introduction](#introduction)