Update README.md

Added paragraph listing the credentials used in example docker-compose files, with warning to change if use for anything beyond testing.

Edited Description for ADMIN_USER and ADMIN_NAME to clarify which parameters are used for signing into the admin panel. (Previously ADMIN_NAME's description included the word username, which is confusing as it is not the username used to sign into the admin panel)

README.md

@@ -115,10 +115,10 @@ If you are running LimeSurvey behind a Reverse Proxy you might need some additio
 | DB_MYSQL_ENGINE | MySQL engine used for survey tables (values: MyISAM, InnoDB, default: MyISAM)       |
 | DB_USERNAME     | Database user                             |
 | DB_PASSWORD     | Database user's password                  |
-| ADMIN_USER      | Initial LimeSurvey Admin User             |
-| ADMIN_NAME      | Initial LimeSurvey Admin Username         |
+| ADMIN_USER      | Initial LimeSurvey Admin Username (for signing into admin panel)             |
+| ADMIN_NAME      | Initial LimeSurvey Admin Name             |
 | ADMIN_EMAIL     | Initial LimeSurvey Admin Email            |
-| ADMIN_PASSWORD  | Initial LimeSurvey Admin Password         |
+| ADMIN_PASSWORD  | Initial LimeSurvey Admin Password (for signing into admin panel)         |
 | PUBLIC_URL      | Public URL for public scripts             |
 | BASE_URL        | Application Base URL                      |
 | URL_FORMAT      | URL Format. path or get                   |
@@ -149,7 +149,7 @@ For further details on the settings see: https://manual.limesurvey.org/Optional_
 
 # Running LimeSurvey with docker-compose
 
-The easiest way to get a fully featured and functional setup is using a docker-compose file. Several examples are provided in the [repository](https://github.com/martialblog/docker-limesurvey). To sign into the example admin panel the credentials are username: *admin* password: *foobar*.
+The easiest way to get a fully featured and functional setup is using a docker-compose file. Several examples are provided in the [repository](https://github.com/martialblog/docker-limesurvey).
 
 ```
 docker-compose up
@@ -161,6 +161,8 @@ http://localhost:8080/
 http://localhost:8080/index.php/admin
 ```
 
+Please note / warning: To sign into the admin panel in the examples, the credentials are username: *admin* password: *foobar*, however, if you are planning for any use beyond testing, it is highly recommended that you use environment variables to define a secure username and password.
+
 # Running LimeSurvey with Helm
 
 A Helm Chart for this Image can be used for deployments. Please refer to the Helm Repository for further details: