add blurb explaining what data is shared with the world

src/libs/util.ts

@@ -20,6 +20,9 @@ const Buffer = require("buffer/").Buffer;
 export const ONBOARD_MESSAGE =
   "1) Read through all their yellow prompts. 2) Add them to your Contacts by scanning with the QR icon that is by the input box. 3) Click the person icon to register them. 4) Show them your QR so they'll scan you. 5) Have them enable notifications.";
 
+export const PRIVACY_MESSAGE =
+  "The data you send be visible to the world -- except: your IDs and the IDs of anyone you tag will stay private, only visible to those you allow.";
+
 /* eslint-disable prettier/prettier */
 export const UNIT_SHORT: Record<string, string> = {
   "BTC": "BTC",