Add [email protected] GPG key

Author: Lars Gierth

src/init-files/init-docs/security-notes

@@ -14,6 +14,10 @@ Please note the following:
   user provided data. But please point any problems out to us in a
   github issue, or email [email protected] privately.
 
+- [email protected] GPG key:
+  - 4B9665FB 92636D17 7C7A86D3 50AAE8A9 59B13AF3
+  - https://pgp.mit.edu/pks/lookup?op=get&search=0x50AAE8A959B13AF3
+
 - ipfs uses encryption for all communication, but it's NOT PROVEN SECURE
   YET!  It may be totally broken. For now, the code is included to make
   sure we benchmark our operations with encryption in mind. In the future,