Add donation QR code

Author: muXxer

README.md

@@ -63,6 +63,8 @@ Would you like to donate to help the development team? Send some IOTA to the fol
 ```
 ADLJXS9SKYQKMVQFXR9JDUUJHJWGDNWHQZMDGJFGZOX9BZEKDSXBSPZTTWEYPTNM9OZMYDQWZXFHRTXRCOITXAGCJZ
 ```
+![IOTA Ledger Donation](resources/ledger_donation.png)
+
 Please know that the donations made to this address will be shared with everyone who contributes (the contributions has to be worth something, of course)
 
 ### As a developer