add Standard credentials to readme

Author: HATBE

README.md

@@ -73,4 +73,8 @@ define('DB_PASSWORD', '<password>');
 define('DB_NAME', '<dbname>');
 ```
 
-Now, you can navigate to http://<ip/host> in your browser.
+Now, you can navigate to http://<ip/host> in your browser.
+
+Standard credentials (from dump.sql):
+Username: admin
+Password: 1234