Update README.md

README.md

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-# AMP Docker image
+# Personal AMP Docker image
+
+Apache + MySQL + PHP
+
+A PHP development environment with Apache, phpMyAdmin and MySQL.
 
 [![Docker Pulls](https://img.shields.io/docker/pulls/matheuspiment/amp.svg)](https://hub.docker.com/r/matheuspiment/amp/)
 [![Docker Stars](https://img.shields.io/docker/stars/matheuspiment/amp.svg)](https://hub.docker.com/r/matheuspiment/amp/)
 [![license](https://img.shields.io/github/license/matheuspiment/amp.svg)](https://github.com/matheuspiment/amp/blob/master/LICENSE)
 
-A [PHP](https://hub.docker.com/_/php/) development environment with [Apache](https://hub.docker.com/_/httpd/), [phpMyAdmin](https://hub.docker.com/r/phpmyadmin/phpmyadmin/) and [MySQL](https://hub.docker.com/_/mysql/)
+## Docker images
+
+This image uses images from the official repositories, so to configure any of the "services" consult the respective documentation.
+
+* [Apache - PHP](https://hub.docker.com/_/php/)
+* [phpMyAdmin](https://hub.docker.com/r/phpmyadmin/phpmyadmin/)
+* [MySQL](https://hub.docker.com/_/mysql/)
+
+## Instructions
+
+* The `www` folder is intended for files that will be offered by the web server.
+
+## Credentials
+
+phpMyAdmin does use MySQL server credential, please check the corresponding
+server image for information how it is setup.
+
+The official MySQL use following environment variables to define these:
+
+* `MYSQL_ROOT_PASSWORD` - This variable is mandatory and specifies the password that will be set for the `root` superuser account.
+* `MYSQL_USER`, `MYSQL_PASSWORD` - These variables are optional, used in conjunction to create a new user and to set that user's password.
+
+Do not forget to edit them in [`docker-compose.yml`](https://github.com/matheuspiment/amp/blob/master/docker-compose.yml).
+
+## Docker hub tags
+
+You can use following tags on Docker hub:
+
+* `latest` - latest stable release
+
+This image is available at https://hub.docker.com/r/matheuspiment/amp/.