Added PayPal donation link to README.

Hvass-Labs · Hvass-Labs · commit 75f27c63dc42 · 2017-04-25T10:35:16.000+02:00
diff --git a/README.md b/README.md
@@ -4,6 +4,12 @@
 
 Original author is [Magnus Erik Hvass Pedersen](http://www.hvass-labs.org)
 
+##  Donations
+
+All this was made by a single person who did not receive any money for doing the work.
+If you find it useful then [please donate securely using PayPal](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=PY9EUURN7GRUW).
+Even a few dollars are appreciated. Thanks!
+
 ## Introduction
 
 * These tutorials are intended for beginners in Deep Learning and TensorFlow.
