chore: add administrator data to "init.sql" file

init.sql

@@ -7,6 +7,10 @@
 
 -- This is a SQL script that intializes the database for SVR.JS Mods directory.
 -- It's recommended to change the default password hash and email address.
+-- Default administrator data:
+-- - Username: svrjs
+-- - Password: admin
+-- - Email address: unknown@example.com
 
 /*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
 /*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;