Added donate button to readme.

README.md

@@ -8,10 +8,10 @@ With this app, you can disable it in one click.
 
 [![Get it on Google Play](https://developer.android.com/images/brand/en_generic_rgb_wo_60.png)](https://play.google.com/store/apps/details?id=com.nutomic.zertman) [![Get it on F-Droid](https://f-droid.org/wiki/images/0/06/F-Droid-button_get-it-on.png)](https://f-droid.org/repository/browse/?fdfilter=move%20certs&fdid=com.nutomic.zertman)
 
-Thanks to:
-http://forum.xda-developers.com/google-nexus-5/help/howto-install-custom-cert-network-t2533550
-https://stackoverflow.com/questions/13981011/cacerts-bks-does-not-exist/18390177#18390177
+Thanks to [xda-developers](http://forum.xda-developers.com/google-nexus-5/help/howto-install-custom-cert-network-t2533550) and [stackoverflow](https://stackoverflow.com/questions/13981011/cacerts-bks-does-not-exist/18390177#18390177).
 
+## Donate
+[![Donate QR Code](http://i.imgur.com/uqXbHUb.png)](https://blockchain.info/address/1NUqm2kyaiRdssFaxYd7CQaWy4og19xH5g)
 ## Building
 
 Clone the project with `git clone --recursive`