Update README

README.md

@@ -5,7 +5,27 @@
 
 Dockerfile to build a [LimeSurvey](https://limesurvey.org) image for the Docker container platform.
 
-# Uploads Persistence
+# Using the apache image
+
+The apache image comes with an Apache Webserver and PHP installed.
+
+## Apache Configuration
+
+To change to Apache Webserver configuration mount a Volume into the Container at:
+
+ - /etc/apache2/sites-available/000-default.conf
+
+See the example configuration provided.
+
+# Using the fpm image
+
+To use the fpm image you need an additional web server that can proxy http-request to the fpm-port of the container.
+
+# Using an external database
+
+LimeSurvey requires an external database (MySQL, PostgreSQL) to run. See *docker-compose.yml* for example.
+
+# Persistent data
 
 To preserve the uploaded files assign the upload folder into a volume. See *docker-compose.yml* for details.
 
@@ -16,11 +36,3 @@ To change to LimeSuvey configuration simply mount a Volume into the Container at
  - /var/www/html/application/config/config.php
 
 **Hint**: If this configuration is present, the LimeSuvery Installer will not run.
-
-# Apache Configuration
-
-To change to Apache Webserver configuration mount a Volume into the Container at:
-
- - /etc/apache2/sites-available/000-default.conf
-
-See the example configuration provided.