added donation button to readme

diff --git a/README.md b/README.md
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 # letsencrypt.sh [![Build Status](https://travis-ci.org/lukas2511/letsencrypt.sh.svg?branch=master)](https://travis-ci.org/lukas2511/letsencrypt.sh)
 
+[![Donate](https://www.paypalobjects.com/en_US/i/btn/btn_donate_SM.gif)]( )
+
 This is a client for signing certificates with an ACME-server (currently only provided by letsencrypt) implemented as a relatively simple bash-script.
 
 It uses the `openssl` utility for everything related to actually handling keys and certificates, so you need to have that installed.