Add disclaimer

Author: rubiojr

ENCRYPTION.md

@@ -1,5 +1,9 @@
 # A note about age encryption in HashUp
 
+> [!WARNING]
+> Disclaimer: the author isn't a cryptographer, so take all this with a grain
+> of salt.
+
 The age encryption used when encrypting NATS messages isn't a suitable encryption method, as it lacks some desired properties for message exchange:
 
 > Indeed, we don't want people to use age for messaging, because it would be a pretty lousy messaging encryption tool: no forward secrecy, no ratcheting, no authentication... age is optimized for file encryption, so the occasional reminder of that is something we want to keep, although I agree PAYLOAD would be a good generic word.