add donate Button

README.md

@@ -61,6 +61,11 @@
      *Windows users* see [Vundle for Windows](https://github.com/gmarik/vundle/wiki/Vundle-for-Windows)
 
      Installing requires [Git] and triggers [Git clone](http://gitref.org/creating/#clone) for each configured repo to `~/.vim/bundle/`.
+     
+4. Concider donating
+
+[![](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=T44EJZX8RBUWY)
+
 
 ## Why Vundle